Well, I will say the lack of pointless rainbows in the scene is a bit of an improvement... As well as noting that character shoulders/shoulder pads have been shrunk below the World of WarCraft-class sizes they had before... So maybe people might have been too hard on Blizzard, just like with SC2; after all, their early shots for the original StarCraft looked, well, just like WarCraft. (and then Blizzard promptly threw all that art out a window to give us the dark'n'gritty look that we loved)
Of course, I'd still like to see them put a bit more effort, especially if they can work in some shaders to try and re-create the sort of darkness that we saw in Diablo and Diablo II; they won't come naturally, since then those atmospheres were partly a result of the limited 256-color palette. What they probably need is a new HDR shader. (none of that OpenEXR crap I've had to put up with for what, 4-5 years now?) 'course, that may be hoping a bit much, given how Blizzard consistently sits maybe 6-8 years behind the technology curve.