The 'verse is awful, it's like ZOMGLOLZORSLETZMAKEITALLDARKANDDOOMFULANDTHENSOMELOLZORZW00TARENTWEL33T.
Some of the models are good, I do love the Tau by way of an excellent concept with good fluff and detailed additional races. But the Orks, Eldar, Dark Eldar, Necrontyr, Humans, etc just... well, firstly, a totally humanoid galaxy doesn't work for me (OK, Tyranids, so make that MOSTLY humanoid, but nevertheless most of the playables are really boringly terrestrial). So yeah, with some radical alterations I wouldn't mind it but currently the ideas fall a bit flat. I mean, there aren't even many rules for the different physics on different worlds which I'd make a priority for designing a galaxy-wide strategy game.