I also don't feel (like most people do) that Jar Jar destroyed TPM. Its flaws run far deeper than that, and Jar Jar wasn't even the worst symptom.
All the scenes toward the end of AOTC with the digital Threepio really make me cringe. I love Threepio, but that was too much. The flying Artoo irritates me, too. Apart from this and the stilted love scenes, I enjoy most of that film.
Ewoks... well, I don't hate them, but I do agree they were the weakest point in ROTJ.
And the Boba Fett cartoon in the Holiday Special is the weak point in that film - the one thing that really prevented it from being the 100% complete crapfest it was meant to be. Such a shame they had to include that part.

--SKot