The Star Wars Prequel Trilogy. Did this with my fiance to see her reaction and mine after so many years, like a science experiment (she did not appreciate I had her watch movies even I don't like =). And... yep, it wasn't just perception at the time, they're still bad. Although, it didn't offend my sensibilities as much this time, and yielded some different results than I previously remembered. I always thought Episode I was the best of the bunch, the most like a real movie, and while it does benefit from having sets and other practical shit, it's a horribly choppy bore clearly made by a guy that hadn't directed a movie in over 20 years. Even more strangely, Attack of the Clones, which I previously thought was the worst, was actually the most passable. It was a bad movie, but at least it flowed like a movie and not a bunch of mandatory clips and wipes (though it's almost literally a cartoon). Revenge of the Sith was about the same, just ridiculous, and the final crapper to a failed endeavor (except where money is concerned, of course).
Anyway, one significant thing did occur to me during Episode I that should be said for Lucas, which is that these were still very influential movies for better or worse. I don't think there was such a CG heavy live action movie before Phantom Menace, and Eps I and II took it to another level. Now, it's common place, it's the norm even. So, as bad as it was for Star Wars and maybe movies in general as the sterility of the 00's set in, you can't deny Lucas' technical influence as a filmmaker; even when he's otherwise stinking it out as far as story, character, and acting goes, he's still revolutionizing the industry. Fucker.