nightstalkerpoet said:

For all the flack the prequels get, RotS has always been held in higher esteem than the other two. So I think it is reasonable to reconcile between that film and the OT, even if I feel Eps 1 and 2 should be made to match the rest.

Rather than use that as a reasoning, I'd point to Yoda telling Luke he must "confront" Vader, giving the impression of initiating a battle. Also, Obi-Wan stating that if Luke will not kill Vader, "The Emperor has already won". Both statements give reasonable support to a Jedi being the aggressor in a battle.

I sort of agree. I wouldn't call the Jedi an aggressor, but obviously you don't fight to lose, especially against a Sith--there's quite a lot at stake. And you're right: if the Jedi doesn't confront his enemy full force, then the enemy has already won.

doubleofive said:
I don't agree and feel that Obi-wan actually failed at his own teaching by using the Force for attack during Episode III, and that I feel he would have learned from his earlier mistake against his old apprentice.

I don't think Obi-Wan failed at his own teaching; he would have if he'd used the Force for attack during a training exercise, but he was no longer Anakin's teacher at the time of their duel--he was his enemy. When he's fighting Vader, he's fighting to win.