I'd disagree with the list personally. Anyone who had high hopes for Duke Nukem: Forever, or any positive ones, is an idiot by default. Personally, my list of disappointing games of 2011:
5. Call Of Duty: Modern Warfare 3.
This is a game series that can be best described as having questionable quality, but even then this game really does it's best to be a nothing game. While the other games have had their moments, this game can be described as being a large game about absolutely nothing. It's plagued with plot problems (e.g. this seems like something a hack writer who spent his teens during the "red scare" days) and decides to kill off the characters that sold the series. The ending, for the climatic finish of the Modern Warfare plot line, is bland and unrewarding. I hope there isn't another Modern Warfare game, but then again they probably want to milk the cash cow some more.
4. Saints Row The Third.
The previous Saints Row games emphasised the idea of choice and the freedom to do stupid things. So it's a let down that some of the choice has been stripped from you (e.g. gender on a slide scale). Not to mention, the story has been watered down by Johnny Gat being killed off has left only the weakest cast members from the original and no one to fill the rift. Not to mention there's no more side questions with a bizarre array of characters who have nothing to do with the Saints but rather reminders of how weak of a character line-up it is.
3. Mount & Blade: With Fire And Sword.
This is a game best described as being faulty due to source material. I don't doubt this game tried to stay true to the novel, but by doing so has crippled the game. The ability to wield guns has left the combat more like a stroke of chance rather than skill like the previous games. The inability at first (until a patch) to be a female character was a terrible design decision considering the previous game not only allowing but also making gender affect gameplay. It's a long string of bad ideas that has made the game generally disappointing. Still perhaps enjoyable, but still disappointing.
2. Dragon Age 2.
To be honest, Bioware was going to have a had time making a game not disappointing due to how good Dragon Age: Origins was. However, to produce a game this rushed and poorly made is an insult not only to the series but to the developer's record of making good games, especially games well written. The characterisations are awful and bland (with the inclusion of a JRPG character that doesn't belong), the environments feel cheated considering how copied and pasted it is and the story is awkward and unenjoyable. It's hard not to get a bad taste after this game.
1. Brink.
This was a game that advertised choice. The ability to choose guns upgrades, the ability to choose how your character looks and the ability to choose abilities. What a shower of disappointment when you find out the limited gun selection, the incredibly limited character creation and the poor array of character builds. While there is a parkour element, it's half done and rushed, feeling more awkward than free-flowing. The story, while holding so much potential, was badly written with poor displays of story and poor characters in cutscenes. Instead of executing a story mode where both sides are equally good in their cause but you feel bad that they can't come to an agreement, you get a story mode where both sides are equally bad in their cause and you feel bored and tired that they can't just stop fighting. You feel more like a mother with children who fight a bit too much rather than a sociologist or a historian discovering a conflict where either side had it's interesting parts. This is Mirror's Edge if Mirror's Edge was rushed and made by a poor developer who just couldn't care for the game they were making but just wanted to make money. So little effort was put into this that it's a wonder it wasn't filled with glitches.