Movie-wise? pretty bad actually. Horribly edited with even worse setups than Ong Bak.
However, I'll be damned if it didn't have some of the best fight scenes I've ever seen. Three stand out already as just freaking awesome, including one that didn't seem to have a cut for like five or ten minutes. Pretty amazing stuff, and downright brutal at times.
Tony Jaa's movies have so much potential. They've already got the action choreography down, now he needs to get a good filming crew and maybe even a writer. Then they'll be taking the modern kung fu movie to new levels.