I bought it a few days ago. It's good enough to keep me off of this forum for 2 days straight. If you like strategy games, save up your Christmahanukwanzikawhatever money and get it. You most likely won't regret it.
I beat it a while ago. It kind of ruined it for me when i found out my comp wouldnt run the game on the highest settings, but i still played it through. My creature was pure evil, but only because i had him out stomping attacking armies the entire time, he was a saint within my own walls.
The creature seemed to play too small a role in the game compared to the first one. In this one he seemed more like a usefull tool to get you out of a tight situation. I had more than 50 hours logged into ONE player file on BW1, i ran through BW2 once and then put it down.