Raise your hand if this (or a similar incident) has ever happened to you:
The other day I was playing Resident Evil 4 (PS2 version). However, I had a hard time with it, despite beating it a few months ago. I was fumbling with the aiming and rotation systems, constantly cursed the game for not letting me strafe, and kept forgetting how to turn around. I pressed R1 with the intention of firing my weapon, but instead started aiming, and expected L1 to throw grenades. Why? Because I was so used to playing third-person shooters, which often use an FPS-style control scheme for maximum shootability. Once I got used to RE4's control scheme, as an experiment, I played GTA: Vice City, and found myself practically unable to move.
So here's my point: Why don't all games use some sort of control-remapping system? Of course, if all games controlled the same way they'd be boring, and not all games use grenades or whatnot, but shouldn't you at least be able to change all that stuff in the controls, like having a permanent aim/walk system or something? I think a game that let you excersize that much control over it would be a great thing.