I was thinking about this a bit the other day. If I remember correctly, Nintendo introduced the Rumble feature with Star Fox 64 (or at the very least, they hyped it up heavily for the game), so this thing's been around for 15ish years now. I think it was implemented for the sake of creating a greater sense of immersion while playing games, being able to "feel" what's going on with the game.
It was kind of a neat feature early on (Well, mostly just in Star Fox 64 because that thing's rumble was off the charts whenever you finished the level with a big explosion), but I've gotten to the point where I barely even notice it anymore. I just kind of take it for granted. Do you feel like there's been a game where the rumble feature has really been used to enhance a gaming experience for you?
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http://i.imgur.com/CbfFb.jpg