just saw this the other day. pretty good. I can't say it was great but its definitely worth the price of admission and the price of a 8 dollar soft drink with a 12 dollar bag of popcorn. And I ate about $20 worth of high powered weed so that helped.
actually... $50 seems a bit high. the trailers showed off all of the worthwhile effects anyway. I don't regret seeing it but it could have been so much more. Still, it was 100's times more entertaining than the Conan movie that came out last year.
i'd give it 6/10