It's up there, but at least Fire Breathers was kinda but not really playable.  Cheetahmen II though is just falt out unplayable.

 Alfredo on Action 52 is unplayable lol and fire breathers sucked since the other player won't even move (well it wouldn't move for me)

Jet moto series on PS1... my god it's was boring

Uhm I rented it when I was like 5 <_< it had no instructions and all that I could seem to do is input years and do this sailing game which I never could figure out how I got to it.  So from a standpoint of when I played it, it was unplayable, and now it would probably be boring to the point of unplayable.

Ah yeah, I forgot about the reports of Alfredo.  Oddly enough, I the rom I have actually has a working version of Alfredo, not worth hunting down though.  If memory serves, I think Fire Breathers was a Co-op game, hence why the game was so easy.

ET: The Extraterrestrial (Atari). Spielberg pushed Steve Ross to go gold in like 4 months time for the launch of his big movie. We all know how that turned out. Poor Howard Scott Warshaw.

E.T. Atari 

Biggest disappointment ever.

ET all the way

I just remembered my biggest disappointment of all time. A true abomination that should have been truely great - Force Commander. I, and many people I knew at the time were young Star Wars nerds who happened to have a great love of RTS games. Force Commander looked to be the greatest game of all time on the horizon. We eagerly awaiting the masterpeice that would undoubtedly replace StarCraft in our hearts.

Such a terrible game. How can you have an RTS game, with AT-ATs, and still be awful?? That question will resound throughout the ages.

Force Commander's only redeeming quality was its soundtrack. Even down to today I sometimes listen to the Leviathan/Rage mix of the Imperial March.

Originally I felt BttF was a poor game as well, but after playing it for a while (and eventually beating it) I now feel it's almost average.  It's not too bad, even a little fun at times.  Strange for a LJN NES game!

Anyway, here are a few of my least-favorite games:

Hydlide (NES)

Funny World & Balloon Boy (Genesis)

Mohawk & Headphone Jack (SNES)

Bravoman (TG-16)

Tennis (PS1)

Final Fantasy VIII (PS1)

Superman 64 (N64)

The Bouncer (PS2)

Kabuki Warriors (XB)

Universal Studios Theme Park Adventure (GCN)