Gran Turismo - It is just bores me to death. I would probably hate Forza if I played it too, I just don't like simulators.
Oblivion - I watched my friend play it and it looked utterly dull, I do want to try Skyrim though.
This isn't really a hate situation, but most people consider GTA: San Andreas the best, but I think Vice City is the pinnacle of the series.
Platinums: Red Dead Redemption, Killzone 2, LittleBigPlanet, Terminator Salvation, Uncharted 1, inFamous Second Son, Rocket League