Ewan as Obi-Wan was one of the only good things in the PT.
Lightsaber duels are quite entertaining, at least in TPM and ROTS, but they aren't as epic as OT fights.
Some scenes in ROTS are good and fun to watch.
But I don't understand the pod race. It's like the most boring thing ever. CG pods racing many many many minutes. I actually once fell asleep during it! It just feels stupid and useless, just to show what ILM can do (which isn't even very impressive)... And the extended race. That was the worst DVD change in TPM! At least in my opinion.