Bad Rats.

Strangely I'm having trouble thinking of much... I've had fairly good luck with picking so far.

I suppose my mom's effort to get my sister into the Genesis via Barney's Hide and Seek is easily the worst I've ever played, but it honestly seems designed for 2 1/2 year olds. 

Otherwise, I think it'd be unfair to mention any of my Atari or Intellivision games as the technology just wasn't strong enough. I did have the misfortune of renting Superman 64, but that's too common an answer.

SOOOO I guess I'll go with Barney's Hide and Seek.

Haha I watched someone play Heavy Rain, which is to say, I pretty much had the experience of playing Heavy Rain.

Assassin's Creed II, though, I don't really agree with... I actually remember liking that one the second most of any of the franchise, trailing only IV. Was the combat just too repetitive for you?

Saints row 3 or 4 can't remember.Traded it in the same day I got it.

The easy response would be some shitty old Atari title or no budget PC disaster. But as far as legitimate, full price games that I thought would be good, I'm gonna say X-Men for NES. I think AVGN's video on it sums it up pretty well. I expected awesomeness, not knowing what fear amd revulsion the LJN rainbow logo should inspire. Man I was so pissed when I rented it.

If CoD Ghosts is the worst game you ever played then you have had a glorious gaming life. That game has issues, but damn, there are so many much worse games.

Excluding shitty shovelware games or old games limited by technology, I would say maybe Superman 64? There was so much potential, yet the gameplay revolves around shitty controlling flying trying to go through rings. And the MP was some sort of Professor X hoverchair battle type thing that I have burned from my memory. What an incredibly shitty game.

I could also list a hundred NES/Genesis games. But that's probably not fair.

Superman 64

I too can't remember which Saints Row it was, but one of those was indeed an absolute travesty lol

Final Fantasy 13.

I don't have a worst game I've ever played. Just some games that annoys me so much that I stop playing or just forget about it.

The last one was Danganronpa.