Hmmm...I'd say there's no such thing, but I'd be lying. For the most part, I had a pretty good idea they were bad games before buying them (I try to always do my research beforehand), but thought I'd give them a chance, given the series they were a part of.
Games I completely regret buying:
-Yoshi: Topsy Turvy (Not my fault, twas a gift. What a waste of plastic.)
-Commander Keen: GBC sequel (The actual name fails me, but it put the PC versions of Commander Keen games to shame. Total impulse buy, I should've gotten the generic casino game instead...)
-Bomberman Hero (Hey, where's the multiplayer? What kind of Bomberman game doesn't have multiplayer?!)
Games I might still buy for significantly less money than what I paid:
-Sonic & the Secret Rings (This game needed GCN control options to compensate for its sub-par Wii control schemes, and the music was lacking.)
-Shadow the Hedgehog (recycled SH polygons clashing with new style, tedious collecting missions, and somewhat ridiculous storyline branching ruined this game for me.)
-Final Fantasy VII: Dirge of Cerberus (WAY too linear with no interactive surroundings, aka a hallway setup, and nothing short of pathetic AI. It has nice CG sequences, though, so it might be worth watching on Youtube in movie form, minus the horrid gameplay.)
-Metroid Prime: Pinball (When compared to similar pinball games, this game is disappointing. I just wanted the DS rumble pack for Starfox DS. There was no other way to get it at the time.)