X2 (Jedi) vs Ben Skywalker

Round 1 - Sabers

Round 2 - Force

Round 3 - All-Out

Ben should take this IMO.

X2 doesn't have any notable power feats, to memory, so Ben should win in that contest. And in general combat ability, Ben has just impressed me more.

Well, he was able to fight Grievous without a lightsaber with Mace's help.

He beat X2 in a lightsaber fight, and rescued Luke Skywalker, which should imply, that X2 was at least slightly above Luke at that point.

That's pretty dumb, to be honest.

Then how do you explain Luke not being able to fight them off?