This episode had me nearly crying with laughter on several occasions. The ethical doctor torture droid, the Emperor with his stylist. Pure class. I'm not sure how someone who's never seen Star Wars would take this ep though as there were some very specific in-jokes that only hardcore fans would probably know about (Dengar the Bounty Hunter for example)
That being said - I don't think there was a single weak gag in this special though I am, admittedly, a bit of a Star Wars geek. Together with the first SW special it is probably the best piece of SW parody I've seen (and there's a lot of them out there).