I thought the IDEA of the fall of Darth Vader was pretty awesome. I mean, the Lucas apologists have a bit of a point that the basic premise is pretty epic on a Greek tragedy type of scale. It had SO much potential. Unfortunately, the motivation for his turn (along with so many other of the MOST important things like dialogue, script, acting, and directing) was done SO poorly that it mitigates any and all awesomeness that could have been.

The only other thing I can think of at the moment was that I liked Ewan McGregor as young Obi-wan. He did a pretty good job convincing me he was a young Alec Guinness, considering what he had to work with. I think had the films lived up to their potential, he'd have been REALLY great!

That's really all I can think of. But at this point, it's been so long since I've watched even a clip from a prequel that I really don't remember much at all. And I prefer it that way... Less baggage to carry into my viewing the OT.