Saw this yesterday. All the technical aspects were great - the direction, the acting, etc. I had a tracking shot boner.
Overall, I thought it was...OK. The funny parts were mostly funny. The social commentary it attempted sometimes seemed like something out of the mouth of a college freshman after a few bong hits. "Yeah, man! Hollywood has like, no substance man!" I don't disagree, really, it's just that it's been done and it wasn't redone with much new ground being broken. I think this movie wanted to be something important but it came across as heavy handed and forced at times.
There's some ambiguity that will annoy people. I tend to give a lot of leeway for movies that aren't plot-driven as far as, I don't know, tightness goes? I don't really need a clean ending, I guess.
All that being said, I was interested the entire time. It was worth it, overall, even if it didn't reach a point of greatness it clearly wanted to reach.