Count me as someone who thinks 3D films can be neato and occasional gimmicky fun, but they're only something I'd want to see every now and then. In other words, a fun visual show when you're in the mood for that kind of thing, but mostly a bad way to see a movie.
I liked Coraline in 3D, and thought that it was ok for the new Tron movie (didn't think the movie was very good, but the 3D was an ok fit), but mostly it'll make me less, not more, likely to see a movie.