Finally saw it yesterday. "Technically and visually stunning" is accurate, and it was engaging enough to overlook the derivative plot and wooden acting of most of the actors, as well as the heavy-handed thinly-disguised political commentary. The visuals lived up to the hype; the rest not so much.
I have to say though that 3D ruined the experience for me, and in retrospect I'd have preferred to see it in 2D. I dislike the distraction caused at the edges of vision where the 3D images no longer line up, and the "forced focus" that comes with 3D. I like to range around and watch little details to the sides and in the background, and that just wasn't possible in 3D.
Overall, a 7. Probably the best sci-fi movie I've seen this year; I was sufficiently entertained.