I think there are some significant enough morphological differences between us to justify Genus level separation.
But it's a tricky question... we really don't have much of a grasp on Species, thanks the joys of genetics. How different is different enough?
wa:do
That's a good point about the morphological differences, but I'm finding the psychological similarities astounding. Also the genetic evidence seems to place us much closer than was once thought. So nowadays I'm leaning towards including us all in the same genus.