Yes, pretty much my opinions as well, right from the beginning of WANTING to give this game a lot more credit simply because Schafer was at the helm, but really I couldn't stand certain elements. It's not *bad*, it's just really not up to par. The RTS portion isn't terrible, but it's really disjointed. They crammed so many genres together at once (RTS, driving, action combat, and rhythm action) that the whole things sags under the weight, if not outright collapses.
That and I'm not a very big metal fan, and according to my contemporaries back home (GameFAQs), that means I just don't "get it".
As for the Jack Black comments, I personally felt that given his style and his definition of panache that he was the perfect person for this role, and to be honest, he actually fits quite well, in my opinion.