Meh, I've never been impressed by 3D. The "3D" in Avatar was subtle and "cool" but not long after I left the cinema, I had already forgotten what was in "3D" and what wasn't.
3D adds nothing of value to a film, at least for me. I've been mesmerised by 2D films for years.
If a film is bad, it's bad - regardless of being in 3D or not. The same goes for a film which is brilliant.
Look around you, that's 3D.