Janskeet said:
Another thing about that scene that always bugged with was this:

Vader throws his lightsaber at Luke and he easily could've used the force to catch it, why the hell didn't he? It was another moment where Lucas can't think of anything good so he simply does it because the plot says so.

Maybe when one Jedi throws a lightsaber guided by the force, it's hard to catch.

Obviously Luke could not easily have caught it. Or else he would have.

It's silly to make up a rule (ex: "Luke should have caught the lightsaber with the Force") for an almost completely undefinded fictional magic system, and then point to the single piece of evidence that the rule was based on (the one instance of lightsaber tossing in ROTJ) which could have just as easily (and perhaps more reasonably) been interpreted the exact opposite way.