In terms of pure shittiness:
-AC:R. Worst in the series by some margin, even worse than 1.
-LA Noire. Ugh.
In terms of how disappointed I was:
-MGS4. It's not as bad a game as the ones above (far from it), but after my previous experiences with MGS I expected so much more.
-GTA IV. It didn't disappoint me as much as MGS, but it was still a pretty underwhelming game.
I bought a PS3 with AC and Uncharted, and got MGS4 and GTAIV short after. It was a pretty shitty start for the gen. Thank god things improved a lot later.
No troll is too much for me to handle. I rehabilitate trolls, I train people. I am the Troll Whisperer.