It's a passable hack and slash, action RPG. Amazon.com has the console version on sale this week, and I heard Steam has it on sale as well.
It's not like other DS games, but since I thought those other ones were ass I didn't mind. It's fun enough, I paid 35 USD for my XBox 360 copy and kind of wish I'd waited for cheaper, but I'll simply trade someone for a different game to make up the difference.
If you have a console available you could rent it once or twice for 10 bucks and get everything you wanted out of it. I expect the PC version is prettier (though I don't know for sure) but on the 360, at least, it didn't look like horrible ass or anything, and there's nothing in the controls that was hard. If the PC version has more camera angles it might be worth playing that version (the lower camera angle on console is nearly worthless).
Mr.Spatula: But hey - there's a demo, why don't you try that out?
The demo is pretty representative of the whole gameplay experience, so this is good advice.