Concerning Syler (based on what I've seen of him during the series):

1. He can fly.

2. He can get shot, then get back up again. (Regeneration like Claire?)

3. He has telekinesis.

4. He's really strong.

5. He takes brains right out of people's heads.

6. It took two people with mental powers to drop the guy; whether the fall off the roof of the school is taken into account there is unknown.

Conclusions:

1. He's a badass.

2. He's a sick puppy.

3. He's the only one in the series that has multiple powers. Whether that has anything to do with his taking their brains, I have no clue.