Like i've said before i would have bought Rayman if it was released last February, but when they finally released it there so many other games to buy

Remember Me - stunning graphics and a good adventure/story experience from new developers as well. Let down slightly by somewhat stale gameplay and little rewards for repeat play. (also easy to platinum, my 2nd ever and I don't usually bother to platinum games).

I wouldn't include Tearaway on this list, too early.

I'd go with Fuse.
the 2 GoW games aren't dissapointments for me at all, I think those sales are pretty decent.
Rayman legends on WiiU is also pretty decent.
KZ:M had a horrible 1st week, but damn impressive legs, I'm expecting the same with Tearaway.

I miss DMC in that list (failed to meet sales target, its developer makes mobile games now). I doubt Remember Me or Deadpool made any money, but they are new IPs.

Call of Duty: Ghosts. I'm pretty disappointed that it sold so well considering it's so bad.

The ironic Remember Me that we all forgot, including the OP

Beyond: Two Souls

God of war Ascension has all kinds of suck about it. My least favorite of the entire series.

From that list I would say Fuse because Insomniac is much better than what they did with Fuse (Though i havent played the game personally).

From personal disappointment Id say Gears Judgement. Even though it sold fairly well it sold little compared to other gears games. And the game was horrible. It is my favorite franchise and I dont want People Can Fly to ever touch it again. Leave it to EPIC if they continue it

From a metacritic to sales ratio Rayman Legends. This game deserves so much more. Im one of those people who feels Rayman has surpassed Super Mario Bros yet SMB sells a lot more.

Though I would say Beyond: Two Souls should get a mention as well.  A lot of people were really hyped for that game and it didnt do so hot.

DMC over all of those. If I had to choose just from the list, I'd say Fuse.