I'm not much of a DotA fan either, largely due to the community, but I think the mechanics are a great idea and if it's integrated with steam Valve may have yet another winner on their hands.
It's always nice to have a serious developer step in and stir up a genre. It would make for some decent competition in a market currently held by DotA(which is a map/mod), HoN(which is a DotA clone) and LoL(which is fun, but not that big).
Plus new IPs are always welcome.