Here is ATI Morphological Antialiasing (MLAA) in action :
Is not bad result
But has I said there problems, it will mess the text and softening instruments needles for example, because have not the ability of discern what edges are fine and what are not.
IMO the in game ant-aliasing is correct at the moment and guess that it will be better with the DX11 optimizations that will let do more dept anti aliasing.