Doesn't even compare to the first Ong Bak. It's set in a different time with different characters. There's more quick cuts, less fighting, more nonsensical attempts at drama. This is a massive departure from what made the first movie great and a disappointment. If you have Ong Bak and want more Tony Jaa, get "The Protector" instead. It's a good action movie, but doesn't deserve to be called Ong Bak 2.
PS: if you're wondering about Ong Bak 3...same thing.