Yeah, motion controls are pretty limited in this game. You do use them quite a bit, but they're not a central feature of the game like they are in Lair. I hope that makes sense.
As for the reviews, the demo seemed pretty good and I can totally see how this would be love it or hate it type of game. Overall, I enjoyed it, but I probably won't pick it up this year. Maybe when it drops to $40 and we're going through a game drought.
My Top 5:
Shadow of the Colossus, Metal Gear Solid 3, Shenmue, Skies of Arcadia, Chrono Trigger
My 2 nex-gen systems: PS3
and Wii 

Prediction Aug '08: We see the PSP2 released fall '09. Graphically, it's basically the same as the current system. UMD drive ditched and replaced by 4-8gb on board flash memory. Other upgrades: 2nd analog nub, touchscreen, blutooth, motion sensor. Design: Flip-style or slider. Size: Think Iphone. Cost: $199. Will be profitable on day 1.