Shaq Fu on the SNES. Using Shaq in a fighting game sucked big time. I returned the game to video store within an hour and claimed it was faulty game and got another game instead for the night.

LMFAO!!
Why is everyone handing out Flameshields?

OT:
Super Sensible World Of Soccer XBLA Remake.

I can't say for sure what the worst game I've ever played is but for this generation Looney Tunes Acme Arsenal wins the title easily.  I rented it for my nephew to play but I tried it before my sister brought him over and it was so incredibly bad that I didn't even bother showing it to him. 

There's really nothing good I can say about the game, it fails in every area of game making.  I'm not even sure how such a horrible game even got made, surely they had playtesters who could have given them some suggestions to make the game better.

Yu-Gi-Oh The False Bound Kingdom

Superman 64

Seems like some users interpreted the topic as most overrated instead of worst.

Worst: Superman 64

Most overrated: Ocarina of Time (yes I went thar) oh noes!

Its ironic that a guy named Starcraft posted in this thread.

Because the game that I bought and enjoyed the least in my life is Starcraft. I never had any of the expansions, but it got such rave reviews that I had to buy it, besides I loved Diablo2 so I figured WTH.

I sucked at it. And I don't mean I sucked a little I blow HARD at RTS games. I spent like 2 months on some kind of 30minute mission (I think, its been years) trying to beat it where after about a half hour your base gets WTF-BUMRUSHED by aliens. I must have played it 100 times and lost over and over. The only game that ever made me chuck my keyboard across the room. It wasn't wireless, so my case fell over :(

Years back I bought and tried Warcraft 3. Figured I would give the RTS genre another try.

Nope, no good.

Chaos Legion.

Long ago in the Super Nintendo`s golden age i bought Krusty`s fun house game, it´s a mistake a carry with my heart all the time

oh shit son! haha.

i frown at the two 'black and white' listings. :(

i wish i could think of more games to go with 'where's waldo' (my pick from earlier).

.... 'bayou billy' (nes) sucks pretty hard.