I really dislike character building. I used to be more neutral on the subject until 2 events soured me on it:
1) I was playing in a 3e tournament and one of the players on our team kept whining about how the 15th level rogue he'd been given was so poorly built. He spent lots of tournament time going over all the changes he would have made if he could. The point of the tournament format is to work with what you're given, be a team, and come up with creative in-game solutions to challenges. All he would do is whine about how he had all the wrong feats and skills. The worst part is that he had a really high UMD skill and an arsenal of scrolls, wands, and other magic devices that he never even tried to use once even after a couple of other players pointed it out to him.
2) I went to a 3e D&D meetup and one of the guys there repeatedly asked if anyone would start up a campaign so he could "test a character build". <rolleyes>Yeah, right, I'm going to go through all the trouble of putting a group together, organizing a campaign, and writing up adventures just so that you can test out a build idea you had.</rolleyes>
After these two events, I came to realize that I really value playing with a group that focuses on what's going on during the game rather than focusing on min-maxing characters out of the game.