Western-developed game with the most disappointing 2013 sales?

[DamnTastic]

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.