Not necessarily in terms of being a live active game now (it still is I guess) but BF4 for me was the an amazing MP game this gen - inspite of terrible launch issues. Titanfall also very good. Halo 5 right up there for a smaller player count title. Destiny as well - but not so much for PVP but PVE was hella fun.
I’d still say even though I’ve not played it for a long while, that my favourite game this gen might be Overwatch. Such a great game.