I see that this has a demo out on Xbox Live and PSN, and from this impressions post
(with video) over at Kotaku it sounds like it may be worth checking out. Not perfect, but it seems like the combat in particular might be worth the budget price.
Of course they couldn't have chosen a worse time to release (Oct 25th) with all the big name games coming out now. I think it is supposed to show up on Steam at the same time, but no sign of it on there yet.