He was the best in the movie by far. His role is so insane and creepy, It is kinda out of ledgers charater alittle. So thats why He got messed up while making the joker. He also was able to be funny, but also stay a badass which is very important to this role.
GREAT MOVIE!!!! congrets to ledger, many awards are coming his way. If anyone else gets best actor award, then the voters need to be shot. for real.