I thought it was awesome. The combat system in Oblivion should have been what Dark Messiah is. I like the whole warrior/mage/assassin approach to level design. I will be picking up this game (or downloading it through Steam) when it comes out.
I wish I could say the same for the multiplayer though. The dynamic between warrior/mage/assassin doesn't really work online and it left me feeling like I'd just played a Source mod. Hopefully it can be fixed.