Can't see how 3D is ever going to be worth it, certainly as far as 3D movies go it only detracts from the experience for me, so if games are anything like that it won't be something I enjoy.
Just seems like a needless gimmick, the human eye is already able to perceive depth in a 2D image, so as a purely visual showpiece it only serves as a distraction and hurts the overall experience, am yet to see anything that changes that for me anyway.
If it ever evolves to become part of the core game design I may well take another look.