It rather that CRPG encourages maximizing statistics, where as PnP doesn't. In PnP the players can try to maximize stats, but they don't have to in order to survive the game. CRPG don't have a referee that allows youto play a weak, useless character.
My problem with the CRPG player is that he is quite offensive in a PnP game. He treats the referee like a computer when the referee is not one (expecting instant decisions and results). Also, he fails to pay attention to the needs and wants of the other players. Also, he can't seem to get out of meta-game thinking and into the story-line.
I have to agree with St. Ehlers that, to me, computer RPGs don't seem like role-playing at all. However, it is what many people think of as role-playing (misguided as they might be).
So I'm trying to get this one player away from the direct mono-linear thinking of CRPG and into the problem solving multi-linear thinking of PnP (not everyone makes an easy transition). The other players don't seem to have any problems thinking multi-linear, just this one player gets frustrated by having multiple solutions.
So do I keep giving tough problems with varied answers that aren't easily apparent or should I dumb things down into a hack-and-slash sort of campaign? I think the other players woud enjoy a hack-and-slash type campaign, except for one. Course I think I would tire of a hack-and-slash type campaign after a few sessions.