How flavoursome is Roast Buffalo?
I can't help but think this will be a winner. Buffalo tastes very similar to beef, but has a richer flavor, almost (but not exactly) like what you get when you dry age a steak.

Buffalo is much leaner, obviously, but I honestly don't think that will make much of a difference in a rib roast. If it were a Chuck or brisket cut, I might feel differently, but a rib roast should not give you any problems, given that you are only roasting it for 1.5-2 hours.

Take it for what it's worth (not much, because it's a totally different cut of meat) -- I had a braised buffalo short rib at Ted's Montana Grill, and it was surprisingly excellent. It was very tender, but was so much more flavorful than a beef short rib.