Hal Jordan is completely broken

Hal Jordan is the secret op of the DC Universe. I'm gonna show you why.

Power:

Let's start with how he deals with Kryptonians. Even in the Post-Crisis age he was able to knock around Post-Crisis Superman and take strikes from the Pre-Crisis Age Kryptonian Superboy Prime. However in the Pre-Crisis and Rebirth Ages he was far stronger, to the point that even Pre-Crisis Superman said that the power of Hal's ring surpassed quantification.

Hal has one shot AMAZO with the power of the entire Justice League and was able to deal significant damage to Captain Atom. Captain Atom was at the very least a casual universe creator (1) (2) and a casual universe destroyer (1) (2). In fact word of god statement has that Captain Atom could create or destroy the multiverse. 

That brings up to the topic of cosmics. Hal Jordan fought Doctor Polaris amped upon the magnetic force of the whole universe, the force holding the universe together (1) (2). Hal beat him by turning his energy into the energy of the magnetic core, overloading Doctor Polaris who previously had no difficulty holding the magnetic energy of the universe. (1) (2)

Hal one-shots Krona and was even able to injure him when he had Ion, embodiment of all willpower in the multiverse under his control. Krona by himself was able to control all the emotional-electromagnetic entities, representing  the 7 mindsets for the whole multiverse, solo legions of superheroes, and defeated Galactus. Hal also survived torture by the 7 emotional-electromagnetic beings and fought Sinestro with the full power of Parallax.

Hal with the other Green Lanterns assembled spiked Mandrakk the Dark Monitor in the heart. Mandrakk was a multiversal threat (who even in that form was stronger then The Spectre and The Radiant).

And finally a rookie Hal due to a timewarp was forced to fight himself as Parallax, and the two were fairly evenly matched, their wills even said to being even (1) (2) (3) (4) (5) (6) (7) (8). Parallax Hal was able to solo a large group of superheroes, casually froze time twice, and defeated Black Lantern Spectre as well as ripping the face off Normal Spectre.

Speed:

A mere hour after first getting his Green Lantern powers, Hal was able to move trillions of miles easily, a feat likely millions of times the speed of light. Hal's probe scan the entire universe for other Green Lanterns and return in a heartbeat. Given that the DC Universe is hundreds of trillions of times the speed of light this is likely sextillions of times the speed of light. As Hal can propel himself with his own constructs his speed should likely be this high at least.

However that's merely how fast he is with his own feats. Getting into scaling...When Hal was brainwashed Barry could not shake him (1) (2) and was able to catch Flash possessed by Parallax. He was able to trap Professor Zoom and even fight him when he thought he was Barry so he was holding back (1) (2) (3). He was also able to catch the other Zoom. 

Oh and recently he almost broke into the speedforce.

Matter/Energy Manipulation:

Hal while dreaming without his ring even being on was able to transmute a person into a bird just by dreaming it and when trying transmuted a toy rocket ship into a real rocket ship. His ring can rearrange the fundamental parts of objects to form the new thing. His ring was able to scan for weak points and rearrange the molecules. The Atom using Hal's ring was able to imperfectly restore the atoms of the JLA and Hal himself was able to pack down the atoms of a star. The ring can also affect particles and Hal has twice shrunk himself down to subatomic sizes (1) (2). Hal's ring will automatically regenerate Hal and even pull his body parts together across dimensions. Hal can also create negative matter.

Hal can drop the energy of an object as low as absolute zero, the point of complete atomic freezing. He can absorb energy and create anti-energy. Using his ring he was able to replicate a dark aura that dissolved matter. He was also able to send a construct through a telephone wire. Also recently existed as a being of pure will and came back to life after forging his own power ring

Arisa, a much lower tier Green Lantern could change into a ball of energy and back. Hal and Alan were able to convert the Flashes of their Earths into photons and back. Hal was also able to convert people into negative radiant energy. 

Phasing:

The Ring can make Hal intangible. He can also phase an energy blast into someone's head which he used on Hammond

Invisibility:

With his Ring Hal can turn people intangible and create illusions to take their place. Hal has turned a city's populace invisible before and can conceal things from even Clark and J'onn's senses.

Spacetime Manipulation:

Hal can cause spatial warps or subspace waves. His warping can make an itch stretch like a parsec, a difference of 1.2 Quintillion times. He traveled fine in an area with no space or time as men know it and bent and shattered reality itself in his battle with Sinestro. His spatial warping was able to make infinity bend back on itself. He was also able to teleport his brother across the universe (1) (2) He and Alan also teleported the entire population of Earth-2.

In addition Hal is a casual time traveler. After sensing that the future needed to him he time traveled to the year of 5707. He was able to rip a hole to 100,000,000 years ago. He can send others to different times and send his power beams to other times. He power-beamed both Flash and Reverse Flash through time. Hal can also disrupt the flow of time. Even on verge of death, he was able to stretch a nanosecond into eternity (1)(2). He was able to freeze time up to a thousand miles from a planet and was competitive with Parallax Hal who was a casual time freezer. 

Besides that Green Lanterns can create time as well. Hal created "chronal energy" and time. A flash of his consciousness was able to disrupt a time null zone. He was perfectly fine in a stasis field where time did not move. Green Lanterns can also destroy time. When the Time Trapper got a Green Lantern Ring he destroyed all possible futures of Earth-1.

Sealing:

With Kyle, Guy, John, and Kilowog, Hal sealed Parallax the multiversal embodiment of fear. Hal also turned off Arisa's voice.

Mental Manipulation:

Hal can brainwash the entire Justice League or the entire Earth. He can also copy and return neural waves.

Soul/Spirit Manipulation:

Splits his body from his soul, his soul then teleporting Superman across dimensions. Hal's ring also returned Superman and his spirits into their original bodies.

Power Manipulation:

Hal converted his powerset into magic and himself into a magician and also can steal and restore superpowers

Duplication:

Hal created 20 clones of himself. Note the comic says that this is because of the magnetic properties of the planet, but given Hal’s ability to create massive electromagnetic properties, down to the magnetic force of the entire universe, he could probably replicate this by himself.

This isn't everything, merely what I could compile on short notice.

Summary:

Energy Constructs

Universal+ to Multiversal Power

Likely Tredecillions of times the speed of light

Sub-Atomic Matter Manipulation

Size-Changing

Regen (Likely Low-Mid to Mid)

Freezing (Absolute Zero)

Energy Absorption

Can create negative matter and anti-energy

Matter Dissolving Dark Aura

Transmutation

Can exist as raw energy or will

Phasing

Invisibility (Can avoid even the senses of Superman and Martian Manhunter)

Illusions

Spacetime Warping

Time Freezing

Spacetime Destruction

Spacetime Creation

Casual Time Travel

Can send beams or others through time

Can teleport others

Sealing

Brainwashing (Planetary)

Can copy neural patterns

Soul Manipulation

Spirit Manipulation

Power Manipulation

Power-Stealing

Potential Duplication

In Conclusion:

"In brightest day, in blackest night

No evil shall escape my sight.

Let those who worship evil's might

Beware my power...GREEN LANTERN'S LIGHT!"