When I get someone who always has to be the baddest and always win and so forth...I 86 him.
I look at the game as mutual story-telling, with random elements enforced by the die rolls. The 'random' parts discourage munchkinism of any sort, from chargen on. The other really important ingredient for a real rpg, to me, is one individual who can be impartial and engender trust in the players...the GM.
*shrug*Some gamers and gaming styles just are not compatible.