Personally speaking, my preference varies from game to game, heavily dependent on the number of buttons the game uses and how they're associated with one another. Every time I pick up a console version of Street Fighter, I'm frustrated by Weak and Medium strikes being on the controller's face but Fierce strikes being on shoulders--it just feels wrong. On the other hand, a six-button game with four attack buttons plus, say, a "run" button and a "block" button works fine for me on a controller.
In the past, I actually preferred the PS2 controller for Tekken IV-V. I can't imagine I'd be able to put up with a PS3 or 360 controller, though--the analog triggers reduce the number of viable button inputs by 2, and for Tekken, I'm quite fond of using the spare buttons to map multi-button inputs that I have trouble hitting simultaneously. (I feel kinda like I'm cheating when I do that, but I fight better, so I get over it.)
I'd still love to get a fight stick, though. Not because I play a lot of fighting games, but because fight sticks recently have been getting really nice, and I'd really like to have something high-end and well-crafted for my gaming systems. (I'd probably use it mostly to play Pac-Man: Championship Edition, but still.)"
I wonder what platform the people who complain about the controls are playing it on. Xbox? PS2?"

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