It's got a storybook, family-friendly look and feel to it, and it's shamelessly derivative of Blizzard's definitive action RPG series. It's a fully 3D action RPG that's like a combination of Diablo and its sequel, but with better graphics.
That being the case, if you've been hankering for a good old-fashioned monster-and-treasure-filled dungeon crawl lately, you should check out Fate. Though Diablo-style hack-and-slash role-playing games have proliferated on video game consoles these past few years, for whatever reason, they've been scarcer on the PC.