I like it a lot (PS3 version). It's exactly the kind of game i've been waiting for since I completed Legacy of Kain - Defiance all those years ago. It's an old fashioned action adventure game with some surprisingly complex and challenging puzzles and relatively deep combat mechanics. Controls are very fluid and responsive, but I don't like how blocking is handled. You basically have to wait until War has completed a move and then press and hold the guard button. If you try to buffer the command in earlier War will just stand there and take a beating - not very elegant to say the least. No big deal though as the combat portion of the game is rather easy. It also gets pushed more and more into the background the further you proceed. By the way, I think Darksiders is the first game with enjoyable on-horse-combat. It's simple, yet very effective and it looks just as powerful as it is. Too bad you get Ruin so late in the game.
The graphics aren't going to win any awards for outstanding technological achievements, but I really dig the art (so what if it looks like WoW? - Might as well say WoW looks like a Madureira comic book then. His art just looks like that, and has in fact been looking just like that long before WoW came out. Probably no coincidence that Blizzard picked him for drawing WoW comic books)
Both War and all the creatures, in particular the towering bosses, all look appropriately menacing, are richly detailed and they also animate incredibly well. Effects, fire in particular, look also fantastic. I actually like the backgrounds too. I don't think they look sparse, just desolate and devoid of the shiny wet look that's so commonplace now in games. Dungeons look really nice actually.