Look at the update. The games were returned because 'they didn't work' [?], not because everyone thought it sucked.
No, I think Halo Wars is gonna get a higher rate of return, to be honest. Not because it's a bad game - far from it - but because you really do have to wonder how many casual Halo players are gonna pick it up, and be dissapointed that it's an RTS of all things.