That kinda surprises me tbh. This movie hasn't been especially shot for 3-D or anything. I imagine the 3-D will look 'OK'.
I don't mean to say the special effects will be 'OK'. I imagine/hope the special effects will be quite good. Maybe not Smaug good, but still pretty good.
However the 3-D effects specifically, or what 3-D will add to the film over the 2D version I thought would probably only be pretty marginal.
I don't actually know, but based on what I've read/seen so far, I'll be pleasantly surprised if the 3-D elements of this film are significantly above average.