The fact that GTA V was so overly hyped, and made so much money was disappointing to me. I enjoy GTA games, but honestly, this was a kick in the teeth to the industry. It showed that if you throw enough money at something, you can create a hype filled game that is great for a while, but ultimately falls flat in meaningful (yet important) areas such as storyline and emotion. I'm annoyed that they failed to even match previous storylines such as CJ's from San Andreas, nevermind improve on them given the $$$'s they threw at it. In the same vein, I'm pretty annoyed about SR4's world just being a repeat of SR3.
Big disappointment was that the next Zelda title announced on the Wii U is a dumb spin-off! But that's pretty much besides the point. Other than that, I'm very happy with 2013 in gaming.