I think in terms of post-3D looking really bad it's getting alot better. However...

... I thought this office scene ^ in STID looked mental, with the characters appearing to exist on two different plains of reality. But mostly post-3D films are more subtle now. Most of the time you forget they are even in 3D ('til you get to a night scene and you can't see sh*t) making you wonder why you had to pay extra for it.

But a film actually shot in 3D like Dredd or Avatar can be absolutely stunning and is worth the money at the theatre.