It's pretty good too, although there seems to be an issue with the stats updating - I hit rank 2 at the end of a match but 2 days later my stats page still shows rank 1. I've no idea where I'm supposed to report these things. Stupid open betas.
But the actual combat is really well done. Maybe some balancing issues to be sorted (Eldar and Tyranids, I'm looking at you) but it works well.
