What legacy IPs do they have? The only THQ games I can think of that haven't been auctioned off are de Blob, Destroy all Humans, and Darksiders. All of their earlier games, that I can remember, were licensed.
I think Sony buying Darksiders would be a good move, but Nintendo would have been better off buying Vigil, as they really need more Western studios. Nintendo really does like their developers to be of a certain mindset though, and the fact that no one wanted the studio is telling.