Gears of War 4, it's an amazing package. Campaign is only second to GoW2 imo, horde mode is good but not perfect and I love the multiplayer.
I like Halo 5 too. Lately I've been playing a lot of MCC and I think Halo 5 has the best multiplayer by far. I just can't get along with CE, 2 and 3 multiplayers, 4 is decent. Last night I fired up Halo 5, played some standard versus and Warzone Firefight and it was great. I'll be playing it much more in the future.
Campaign was good too despite the story issues. It's fun to play, still one of the better 1st person campaigns when it comes to gameplay.