I've had a few good hours gaming on the PS3 now, and much of my focus has been on the Sixaxis controller. I found its light weight a little bit disconcerting; I'd almost say that it has a very cheap feel at first. I initially thought this was a bad thing, while thinking that I would hate every minute of use because of the lack of rumble. A long play test proved me wrong on both accounts.
I didn't miss rumble nearly as much as I thought I would, and I barely even thought of it when I was playing Resistance. While the controller feels cheap when just holding it, the light weight makes it incredibly comfortable in your hand when you're actually playing the game; it seems as if it almost disappears. While I still wish Sony would move the analogue stick to the dominant position on the left side, overall I enjoyed the time we spent together.
A few notes on the motion-sensing capabilities of the controller: so far I haven't seen them used well. I turned them on while playing Motorstorm and the game became almost uncontrollable. In Blast Factor if I tilted it hard either left or right, I sent a wave across the screen, but it didn't feel very responsive. In Resistance, if a bad guy grabs you, you have to shake the controller to get him off. There wasn't much in the way of a warm interactive active feeling when this happened. I couldn't tell if I was doing it right, and without rumble as feedback it didn't feel like I was having an effect on the game.
This is really an issue with developers using the technology better; what little I played of Warhawk with the Sixaxis I enjoyed. But for right now… it's mostly a gimmick. Still, the controller feels a lot better than I expected it to, which is a good sign.