Hm , there were quite a few games that I've enjoyed from 2014. I think I'll mention a few of those, as well as a few honourable mentions.
Watch Dogs - While it was a disappointment for some, I was one of those people that really enjoyed it for what it was. While the story was decent, it was mostly the gameplay that made finish the game since it was a lot of fun.
South Park: The Stick of Truth - Really fun game that truly felt like watching an episode of the series. I also liked how the turn-based combat was a bit more engaging than those combat systems tend to be, with me having to press a button at the right moment to succed with an attack or block an enemys.
Call of Duty: Advanced Warfare - Good to finally see a CoD game that actually feels fresh and not just completely rehashed. While the story was overly predictable and not really original (Tom Clancy's Hawx has almost the exact same story, only with aircrafts instead of exosuits), it was still enjoyable and I had some fun with the multiplayer.
Far Cry 4 - While the story hasn't really grabbed me, I've had a ton of fun just doing random stuff in the most inviting world to explore since Skyrim. Really beautiful game, and the fact you can ride on elephants is almost enough to warrant it being one of the best games of the year.
Alien: Isolation - Oh man, this game was quite a ride from start to finish. I never really felt safe when exploring Sevastopol, and each encounter with the titular alien is one of the most frightening and scary experiences I've ever had in a videogame. Also, the great graphics were a really nice bonus, especially the design.
Ace Combat Infinity - Mostly because it's the game I've played the most with around 300 hours of game time (including menues and letting the game still be on for smaller breaks though), but it has been an enjoyable time as well. I don't completely agree with the microtransations and the massive grinding one has to do in order to get nice stuff, but as I said I've been enjoying it still. I also really liked the campaign, while it was fairly short it was still really awesome, and I do hope the story will be continued in some way or another.
Middle-Earth: Shadow of Mordor - Didn't really expect this game to be as good as I think it is, but it is. The combination of Assassin's Creed and the Arkham games sure do work together. While the story is okay at best, I'm a big fan of the whole Nemesis system which pretty much makes each playthrough unique by letting the player create his or her own story.