I hate powergamers.
Let me rephrase that.
I hate carrot cake. I hate Euro disco. I hate liver. But I can understand that other people like these things, and their opinions are just as valid as mine.
I simply don't tolerate powergamers, on the other hand. I would rather not play at all than have to play with them. I won't subject my players, who love to spend entire sessions just interacting with NPCs and each other in-character, to the juvenile power fantasies and non-existent social skills of the average powergamer.
I sympathize with any DM who find himself stuck with powergamers in his group. My personal advice is to expel the offending player(s), and run the game you like. You'll be amazed at who you can get to play in your game (such as girls!) once the powergamers are no longer ruining the experience at the table by refusing to roleplay. If the powergamers just want to pretend to have kewl powers so they can simply kill things, they should be directed to World of Warcraft. There they won't have to worry about icky, adult things like characterization and story.
Some kinds of "Fun" really are Bad and Wrong.