I've always like rumble because of the feedback. Playing Smash Bros with rumble turned on makes me more comfortable, because it subtlely tells me I hit someone or am being hit. Whenever I play with the rumble turned off, I feel like something's just missing, and my playstyle is altered. So basically, it's nothing essential, but I like it to be in games.
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Xbox Live: Mach Tornado
PSN: HeyGuysItsGhoul