My experience with 3D is that its not worth it. I usually sit in the back of the room. The glasses are annoying to have on and i see almost no difference.
3D fans, am i doing it wrong? Should i be near the screen to feel a difference? It seems like a waste of money to me. I prefer to watch movies on normal screens. I mean, even the 3DS' 3D effect is better than what i see in the movies and that doesnt require glasses.