Assassin's Creed.
Story was entirely stupid, what with Altair the best assassin in the place breaking the creed so many times it was stupid within the first 30 seconds of his appearance, and predictable to boot. Altair was not the most interesting character, and was very naive on top of that.
The guard AI was also somewhat inconsistent. They could either be complete cretins, such as when you grab one of their peers by the face and jab him in the back and he falls down they don't care, or Sherlock Holmes, you kill someone run off and then think "actually, if I go back they won't know I killed him" but no, from the manner in which I was standing they deduced that I had murdered that man not 5 minutes ago.
The game CHEATS LIKE F***. If I take the time to quietly kill a guy's guards, drop down silently behind him and then soundlessly take his life I expect to be rewarded by NOT having an entire squad of bodyguards chase me out his castle, thanks.
This whole free-roaming aspect, yes, but only if you do it in the area we want you to do it in. The whole... acrobatic arsenal thing too, far too simple, the combat was very easy too. The game was a lesson in hype.
The whole cutscene-esque thing when you approached a main target too was stupid stupid stupid. I would've quite liked to have made my escape from the crowd later in the game when I knew where the guy was going with his spiel, but no. Equally so, the first target in the game, you technically break the first part of the creed by
letting him beat his worker to death.
The only reason I finished it was because I didn't want to have wasted the money I spent on it.