Fallout 3 and New Vegas on PS3. It can range from horrendous to unplayable, depending on the size of your save file.

Assassin's Creed 2 on PC, but that was because i ran it on a sub-par PC.

I can usually pick which game is going to be added to the OP and I just KNEW Fatal Frame was going to be up there. You let me down, curl-6.

I think Mass Effect 3 PS3 dips enough to be mentioned here

Enslaved at cutscenes (weird), Fallout 3 and Skyrim. All PS3. Interesting, I also played Bayonetta on PS3, which had very unpolished graphics indeed, but I didn't notice huge frame drops.

hmm its got to be Mass effect 1 on 360 and Oblivion on both ps3 and 360

Mass Effect 1 on the 360.

I remember hearing such great things about it before it came out and then I got it and hating it because the frame rate was terrible. I didn't actually pick it up again until a few weeks before Mass Effect 2 came out.

Probably Skyrim for 360. Bethesda disappointed me on this one compared to FO3 and Oblivion.

Probably Fallout 3 on PS3 or Crysis 2 on Xbox 360. I have ME1 on the 360 but I didn't notice any framerate problems.

Dont play all that much console stuff but Bligttown in Dark Souls(love the game though) would probably be the worst.