Striving to qualify for a character concept. Man, bards rocked - if you could get the stats for one and then proceed through all the steps without him dying on you. I understand why they changed it, but a lot of the romance went out of the class. Paladins, monks - those were hard to qualify for, too. But then monks were kind of weird.
I think I may be peculiar in that I like playing limitations. Sonnets are so much more satisfying than free verse. I don't want to tweak the numbers and figure all the builds and come up with "the character I want." I want to take the numbers in the order they're rolled, find the best class/race fit, maybe even roll for social class, and play the heck out of what I've got, scratching and clawing my way up and really earning every level. I never could sell anybody on this, but I always wanted to play in a Hindi campaign where you rolled up the character stats and then rolled which "caste" you were born into. High STR, Low INT? Too bad, son, you were born into the wizard caste, here's your material components bag and your spellbook, go beat your karma.
I can have fun with the current version; I just feel like later versions are too complicated and too easy at the same time. There's a certain kind of challenge 3.X and point-buy systems don't present me with.
Look at it this way - any old cardplayer can win the pot if he has the means to build a full house. It takes a real poker player to win with a pair of dueces.