The most disappointing game isn’t exactly an award but more of an award of shame. 2014 saw some real stinkers, but it’s usually the big AAA titles that shock us on how terrible they are.
The Elder Scrolls Online
While Assassin’s Creed Unity may be the winner for everyone else as it shipped completely unplayable and ruined the reputation that AC had, The Elder Scrolls Online made me even more upset. How can you take such a fantastic franchise as The Elder Scrolls, create 43,000 miles of land and make it boring and mediocre? That’s all due in part to Bethesda handing the game off to an untrusted game developer. It really felt like it had great potential as everyone saw this one coming. Here’s to hoping the console versions can wring something out of this dry mess.
Runner-Ups
Assassin’s Creed Unity
The Sims 4
The Crew
Destiny
thebinarymessiah.com 
Yep! The fact that I forgot about this game until you made a comment proves that.