Awesome Possum was about as generic as they come when it comes to mascots. Cheap Sonic ripoff with an annoying voice and an incredibly dumb story about Awesome saving the environment from Dr. Machino, a cheap Robotnik ripoff.
But do you know what's REALLY the worst Genesis game of all time? Heavy Nova. Boy is that one seriously unplayable shitburger of a game. A retarded monkey doped up on every possible drug you can think of could come up with better control than this! and the levels. The person who made these must've tried to create these while falling off a cliff, working out the secret of the universe into a simple, unified theorem, ordering a pizza, watching an exciting action thriller on HBO, listening to the news, all the while trying to speed read Moby Dick, and trying to open his parachute- ALL AT THE SAME TIME! An while he was doing this, his IQ was dropping 1 point per second from all the strain! This resulted in short and boring levels with only a couple of rocks and a few robots to avoid.
Don't pick this up. If you value your life and sanity only a tiny bit, don't even think about putting yourself through so much misery. End of discussion.