In your opinion and experience what game(s) on any console, is/are the worst(s)? Why? Just saying a meaningless word or two won't support a good discussion.

I consider that My Sims for Wii and all other My Sims related games, are the worsts ones I've ever played. I've played 2 of them, and it's enough.
You just go around, ask people to live into the houses you make with no money at all. I never found a real chalenge other than have the patience to take care of a lifeless city with exigent people who don't bother paying you after building them a house, shop or restaurant in land wich is not even theirs.

The worst game I've ever played would have to be the Simpsons game on DS. It lasted way too short. It was amusing but way too easy.

That usually happens on DS games. I played Mini-Ninjas, it was fun, but I finished it in one day.
Then I noticed there was a Wii version, and it looked much better.

Defenitly Yugi the destiny.
Way to short, and they came out with 3 versions after it with more cards XD