Before Avatar blew it all up my recent 3D experiences included Beowulf and Coraline, and both of those worked pretty well, particularly Coraline. The physical feel it was given due to the way it was made really lended itself well to the 3D experience. Textures popped and it felt like you were watching a diorama at times. Very charming.
Then came Avatar. I thought the 3D for Avatar was phenomenal, and I'm glad I got to experience it that way in the theater. It's a shame though that most 3D since then has often felt a bit too 'me too' and cash grabby. There are times when it works but largely it seems to be wasted and abused especially with post conversion stuff. Like, I'm thrilled I did not spend the extra money to see Clash of the Titans in 3D after some of the things I heard. But there are others where it seems like perhaps I did miss out. I didn't get to see How to Train Your Dragon in theaters, and after finally seeing it I was kicking myself, but it seems like one where the 3D would have been worthwhile. Animated films seem to fare better.
Other 3D flicks I've seen: Up and Tron Legacy. Up was well done, but I was so absorbed by the movie itself that I didn't even notice it after a while, which is ok in this case. Tron Legacy bugged the hell out of me though. It SHOULD have been an amazing experience, and I do really enjoy the movie in a mindless way (as the blu ray has taught me), but the 3D was wasted here. Barely noticeable, and I was looking for it, expecting eye candy and spectacle. It was the first time I was actually left feeling let down by the 3D experience. If it was a great movie, like Up, perhaps I wouldn't have been so bothered by it, but I doubt it. In my brain "New Tron + 3D = No Brainer", at least it SHOULD. Oh well.
Going forward I'll only do 3D if buzz from Chud or other places makes it sound worthwhile. Like, I saw Thor this past friday (and had a blast with it) in 2D and I don't feel like I missed out on anything. Another reason I'll try to stick to 2D... The ticket prices. When I saw Tron in 3D I paid $20 for my one ticket. It stung a bit when I didn't feel like the movie delivered the 3D the way it should have, and it will be hard to justify paying so much for a so-so experience, and this one was on a big, real Imax screen in NYC. That $20 ticket also seems a bit more harsh when you consider that I got the blu ray set (3D Blu Ray, 2D Blu Ray, DVD, and Digital Copy) for $24.99. I don't even have a 3D tv, but I couldn't resist. My wife still wanted to see the flick anyway. you can question my taste in purchases, but it's hard to argue that that's not a good deal.
Sorry if it seems like I'm rambling...