How good are Nick Fairley, Da'Quan Bowers, Stephen Paea, and Robert Quinn?

i don't watch college football and i'm hoping the Denver Broncos draft Patrick Peterson (i know who he is) but i also know we need a d-lineman and i read that these are some of the best d-lineman that might come out for the draft. so i was wondering how good these guys are. for example say this is the best DE to come out in a 5 years or whatever, or this guy is a lot like ___. whatever you get it