I guess. Personally, I don't like to play gimped characters. Obviously characters are going to have weaknesses in some areas. There is no way to make a character that is 100% protected from everything (Pun Pun aside of course). I certainly don't go out of my way and tell the DM what my character's weaknesses are (Oh, I have bad Reflex saves, so feel free to hit me with area effect spells as often as you like to make it more challening for me). In fact, I think it is more fun for the DM to try and figure out ways to get around the player's offense/defense, just as the player's try to get around monster's defenses and offenses. I don't even tell the DM what kind of character I am playing. I give him an idea such as "warrior type" or "healer type" or what have you, just enough info so that he can fit me into his setting. But you need a certain level of trust between the players and DM in order to do that, and not every group has that.