Burke is far from a scrub. The reason everyone shut up about him is that he is riding the pine. Give the kid a shot, and he will produce in five categories.
It's hard to project if he will be playing any time soon. Everyone knows Luke Scott belongs in AAA, so he could be accomodated with some shifting around. But Scott's probably the guy that goes when Berkman comes back.
I don't know what league format or eligibility he has in your league, but all you can do in yahoo is stick Burke at utility (if and when he plays!). Stick with Bigbie for now if that is all that's out there.