No offense to you guys, but this is why I don't play RPGs with other people. Instead of playing a role almost everybody is trying to make "efficient" "overpowered" characters as if it was some sort of a competition which you can win.

I generally don't play "optmized" characters, but the fact that there are some character types which are more optimal for most purposes (surviving games, making DMs cry, etc.) is well acknowledged. One can have fun discussing those issues independent of any characters one actually plays in a game.

There are however, some circumstances where it really does matter. Say for example one is playing a very high intelligence wizard in D&D 3.5. The fact is that throwing fire balls at everything is very fun, but not at all effective compared to battlefield control and buffing. So if one has a wizard who likes doing that sort of thing, you need an in game explanation for why they enjoy solving things with explosions so much.

It is also worth noting that in some games, the problem of optimal characters gets so severe that it makes it for some arrangements of characters where it is extremely difficult or impossible for a DM to match something that corresponds to the difficulty level of all the characters. A genuine threat to some characters will be the same level that makes other characters useless or dead. The 3.5 Tier list was made to try to help understand and fix this problem. So these issues do impact real game play.