No, Ong-Bak 2 isn't a great movie and, no, Tony Jaa isn't a great actor. But so what? If you love the pure kinetics of a well-shot martial-arts film, Tony Jaa is the most exciting figure to come along in years.
Only the very young and the very undiscriminating will find this movie enchanting -- or even mildly entertaining. Obviously, Jackie Chan isn't immune to making one for the paycheck and phoning in his performance.
The film is about a chapter of sports and international political history that few outside of South Africa would be aware of. In most ways, it's a standard underdog tale, but this one comes with a difference.
Lars von Trier is a fraud, who keeps making movies because he has somehow convinced enough people that his delusions or pretensions (the latter, more likely) are art and that his movies are worthwhile.