PT 2? Seriously? AOTC? That's the worst of the 6. Unwatchable except for the last 40 minutes.
The only Star Wars film that is unwatchable is Jedi. Seriously, it's been years since I've seen it all the way through and it will be longer still. I only recently watched part of it to see the added "Nooooo" to the duel. Fits the scene perfectly.
The film starts as some sad twisted version of the Muppet Show and it ends with a battle on the Build-A-Bear Workshop planet. The whole film plays more like George Lucas's marketing road show.
And in between we get:
-Carrie Fisher trying to act while being coked out of her mind. It's actually funny to watch.
-a chump death of everyone's favorite faux bad ass Boba Fett... I think Robot Chicken was right, Boba HAD to have been drunk during those Jedi scenes. Boy, it's so sad to think Boba's best scenes are in a never-released cartoon.
-while caught in a net Luke asks Han if he can reach his lightsaber. Clearly Luke still needs some Jedi training... he forgot how he was able get his lightsaber just fine by himself in the Wampa cave. Funny stuff.
-not one but TWO terrible songs! Somebody REALLY needs to digitally "mash up" both of these songs to make every Star Wars fan ears bleed! Clearly John Williams was too creatively spent (Star Wars, Empire, ET, Raiders) to give another great theme. I don't blame him.
-and a second Death Star with a new and improved way of destroying it. Removing the guess work out of hitting any pesky thermal exhaust ports, just pilot the Falcon and the entire squadron into the very bowels of the space station (no moon) for the kill! And the Falcon is just as cool and exciting with Lando and what-his-face piloting it.
-and the least dynamic lightsaber dual in the entire saga. They sparred like a couple of younglings afraid of their own lightsabers.
For a more comprehensive list on why Jedi sucks, Film Threat supplies the goods:
Film Threat - 50 Reasons Why Return Of The Jedi Sucks