I really love this game ^_^
It hones your reaction time and strategic thinking skills, not to mention it also somehow inculcates a basic sense of righteousness into the player :P
An excellent way to help bring up your kids too! XD
My personal favourites include Megaman8, X4/X5/X6
The music also has a Japanese vibe to it, crediting it with even more bonuses
i don't really like the newer versions though.. too '3D' for me.. O_O it's just not megaman-like at all =(
P.S. i think there's a megaman anime somewhr.. but i can't seem to locate it.. :S