The problem is there are a billion (or a trillion) droids to every clone trooper, according to the EU numbers. So they can't possibly win, no matter how good they are!
The EU authors, perhaps realizing their mistake, tried to say that the Clones were so awesome they could kill 200 (or 2000) droids before going down. Despite that this is ridiculous considering their performance in the movies (even the Jedi don't do that well!), they would lose badly if this is all they could do.