For me, I would have to say that I feel the opposite. Not having rumble with various PS3 games just seems strange and unnatural. Especially games like Resistance, Motorstorm and Madden. Resistance, being a first person shooter, you expect to get some feedback when you are being hit by enemy fire. With every FPS, you expect rumble to play a pretty key role. With Motorstorm, it's an off-road arcade style racer. What genre would be more natural for rumble? In a game like Madden, when you are playing a linebacker like Ray Lewis, and you break thru the line and smack the running back for a loss with a really hard hit, you expect to feel it a bit.
Rumble is one of the primary reasons that I don't normally consider the PS3 version of multiplatform releases. Take a game like DiRT. With the 360 version, I get rumble, and the rumble is done very well, it's subtle, and not overbearing, and with the PS3 version you get absolutely nothing with regards to rumble. To me, the choice is pretty simple. Same thing will all the First Person Shooters and big action games coming this Holiday. If you own both a PS3 and 360, why would you buy COD4 or Assassain's Creed on PS3, when there is no rumble?