1=Best 10=Worst
By best i am looking for the most useful power and worst i am looking for, obviously, the opposite the useless.
Best
1Peter-absorbs the powers that the other heroes he has met Who wouldn't want to fly,be invisible, time travel and the best part is he can never die. (unless glass is in your head)

2Sylar-knows how things work and steals powers he would be tied for the most useful powers, if he didn't eat brians (i know strange isn't it?), but still has many más powers than Peter does, like melting metal o superhearing.

3Claire-Instant healing
although this would be annoying considering...