The Last of Us Remastered is a better-looking, better performing version of an already incredible game. As such, those who haven't played the original version should buy immediately, and those that have probably should as well.
Advanced Warfare is COD par excellence, a premiere example of the game that's almost a genre unto itself. Its singleplayer is better than most in the franchise, and the multiplayer is probably the best yet.
Unity simply isn't ready for release. The majority of its new systems aren't refined enough, and its existing ones are showing their age. It's still intermittently enjoyable, but a serious step down from last year's Black Flag.