Not that Kameo doesn't deserve that accolade on its own, because it really is an enjoyable game. As the titular heroine Kameo, you have been betrayed by your own sister who has chosen to ally herself with the sworn enemy of all Elves, the Trolls.
However, Black Monday's biggest fault is that it tries to expand upon the original Getaway without fixing the original problems that plagued it; and there was a long laundry list of issues with The Getaway.