I suppose you can count gifts too, but I'm more interested in games that you decided you wanted and bought and found out were utter fail.
I don't generally buy crappy games, but I remember years back the Blockbuster by me had like a million SNES games on sale for $10 each right before Christmas. I talked my parents into getting 3 for me, and my aunt into getting 2. 5 games at once! I'm not from a rich family by any means, getting 5 games at one Christmas was insane.
I can't recall what the other 4 were, but I remember generally enjoying them. Super Empire Strikes Back was one of them for sure. I vaguely think that one was a SHMUP... Gradius III or Super R-Type? Maybe?
Anyway, so yeah... 4 were good. 1 was very, very not good. This piece of pure fail:
Why did I get it? Well, I was super big into NHL '94, and saw a game by EA that looked to be the basketball equivalent of that game, so I thought hey I liked Double Dribble and such, this could be pretty good. Also I was getting 5 games at once, so I just kind of grabbed whatever looked ok. Man was I wrong. Everyone in the game moved like they were in molasses. It was borderline impossible to make a shot. I got called for fouls for going near another player. Yada yada. Basically, it was a completely broken basketball game and Double Dribble was like 8,000x the game that this POS was.
Edit: Or Superman 64, which really is as awful as everyone says.
It really is that awful, although I don't think it's the worst game on the Nintendo 64. I'll leave it to you to imagine how things could possibly get worse. I think the main reason why Superman 64 got infamous is because it's within a popular franchise and received some hype back in the day, so many people were exposed to it, whereas worse games on the N64 and PlayStation have gone ignored.
I forgot one. I also purchased Transformers: Dark of the Moon day one. It was made by the same company that made War for Cybertron. I didn't really care that the single player mode was terrible. But I was disappointed that the multiplayer was a huge step back from WfC.
Everytime I see the Where's Waldo game, I think of those old sour pop-bottle fruit snacks. Those tasted about as bad as that game was, and I ate a package or two of those while my Steve Cocchiara played this rental. Gyah.
At full price? Sonic Adventure DX: Director's Cut for GameCube. Not a bad game, but a horrible port. Glitchy and slow-downy, and that made it a lot less fun. Honorable mention is Mario is Missing, but I bought that at a yard sale for $2, so it wasn't that bad.