I've not lost love for the originals, and I even tolerate the PT well... better than most of you guys!
I just am dejected with the direction things went, and I hate the thought of it somehow being made worse, which I think can happen. The PT's, I guess to me, did detract from SW overall... I didn't dislike the OT any, but I'm the kind of guy who can't separate them either. So it went from 3 great movies, to 3 great movies with 3 you have to accept as part of it too, and they're 3 flawed movies (far more flawed than the OT, even the SE's, ever will be).
To that end I even really like ROTS... I watched TPM and AOTC though recently, and those become harder to watch every time they're on, and I find myself turning the channel. Never thought it would happen but it has.