There seems to be a consenous(ish) among players of Super Meat Boy (a mario-like, very hard, platformer) that using a controller is slightly easier.
Certainly I have tried playing street fighter with a keyboard and found it extremely hard.
Also, I couldn't imagine how you would play a 2d platformer which used an analogue stick. You lose the analogue if you map to the keyboard, and it doesn't really map easily to a mouse (as you can't keep moving your mouse in one direction forever).
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There seems to be a consenous(ish) among players of Super Meat Boy (a mario-like, very hard, platformer) that using a controller is slightly easier.
Certainly I have tried playing street fighter with a keyboard and found it extremely hard.
Also, I couldn't imagine how you would play a 2d platformer which used an analogue stick. You lose the analogue if you map to the keyboard, and it doesn't really map easily to a mouse (as you can't keep moving your mouse in one direction forever).