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First off these are gonna be generalisations and there will always be exceptions. The most important thing is that the haircut suits you, and you know how to work it.

In general, classic hairstyles are good. Stay classy.

Also, I prefer hair that looks soft and touchable. If your hair looks like it could stab someone, you have done something wrong.

For short hair, do not just gel straight upwards. Hair tends to look better when kind of half up, and towards one side. Do not overuse gel either, you gotta keep it looking like you just naturally sweeped through your hair. Your general hair shape should be round (but not bulbous) rather than like a stiff brush.

For medium hair, keep it looking like it has volume. Flat dead hair is unattractive on both guys and girls. Generally, this means sweeping slightly upwards and outwards.

For long hair, grease is your enemy. Why is that I see so many guys with long hair also have greasy hair? Keep it well maintained and looking lush. There is no excuse.

Avoid:
Any kind of short hair where you shaved some kind of pattern into it. Like those kids with the Nike tick on their head. What are you, 10 years old? Seriously what is up with that. This = Douchebag

Teal Ambition!

Hot hair in my opinion is hair that is swooped up at the front (but not too much gel or anything gross).
Short, classic hair like this is also good.

nom.

I hate when guys shave their head completely. Ick!
I dislike long hair with a passion. Gross. But Decoy's hair I don't mind.

Hate these mushroom cuts. Also reminds me of Damien's old hair lololl.

Just make sure it is clean, not greasy, and soft. So, shampoo and conditioner. Even generic .50 cent store brand. I honestly can't tell the difference. xD

I don't do anything with my hair beyond making sure it's clean, not greasy, and soft, so why should you?

xD I sometimes like those.
Once there was a guy with a lightning bolt, and his friend had a stripe off cheetah print dyed into his hair somehow. I thought it was AWESOME.

Streets is right, my old hair was miserable. I ended up shaving it all off because it was stuck in that in-between state from short to long.

I like it where it is right now, about an inch and a half long.
I think short hair works best on guys that are short and bulky (I hate to admit it but I have a broad and stocky body structure), medium hair works tall (6ft+) and built, and long hair works best on slender body types, regardless of the height.

Seriously, I used to have long hair, and I kept it pretty well, but I started bulking up and getting broad in the shoulders and it stopped framing my face and I started looking kind of goofy.