Re: What power sets do you like, but never play?
1) Vehicle Guy: Normal guy with a kick-ass, multi-use vehicle. Think Owlman in Watchmen; think Batman, but without the detective angle. Most GM's find vehicles sorta' annoyingly invulnerable, and hence, I rarely get to play it.
2) Mentalist: I've had a lot of GM's make up house rules to stunt mentalists because they fear the "game warping" powers of them. Hence, they end up being a little blunted and not fun. Else, the GM's who are afraid of mentalists make everything a +30 on the charts, hence ineffective.