In the books Vader was ready to take the Emp himself. The part you see in the empire when his helmet goes back on, well vader was preparing himself to live without the suit.
The books always describe Luke as the most powerful force user, with a couple close. He's certainly regularly described as the best with a lightsabre. Obviously in ROTJ he was pretty much untrained. I guess it's just a game but they went a little OTT with the force use and gave up with the lightsabre combat.
If you ever get chance to start working through the books you wont regret it, almost every story is better than anything lucas has had a hand in.
Some of the later stuff is brilliant once Luke has a whole bunch of jedi masters trained.
Which is why I prefer Jedi Academy\Outcast, the storylines are far better (being post-ROTJ probably helps).