Probably EA Sports's Triple Play 2001 on Game Boy Color. But sports games are really easy targets for me, so I could have included most Fifa and whatever. They just bore the crap out of me.
If I gotta add actual worst contenders as games that I truly hated playing (no influences, just pure gaming experience), then maaaybe:
- Sonic Heroes on PS2 (I'm really sorry for it, but when I get into an Eggman fight the "E" text remains in the background. This version is a complete mess.
- Persona 1 remake for PSP (even if I'll understand how to play it and manage better the grid system, I'll still hate it)
- Unlimited Saga for PS2: horrid combat system
- Batman Forever for SNES: yeah, this one doesn't need to be explained, pretty sure of that
- Battletoads in Battlemaniacs for SNES: leaving aside how much difficult the game is, but all I need to say is: level 5. F*ck this game.