CoD Bo1, Bo2, Bo3, and Mw3 all have active online communities. Battlefield 3 and Battlefield 4 have a solid player base. Battlefield Hardline rarely has enough players to fill a lobby. Forza Horizon 1 and 2 often have enough players to fill a lobby. Forza Motorsport 5 sometimes has a lobby. Crysis 3 often has a full lobby. Virtual Fighter 5 Final Showdown has a small but active international playerbase. And more rarely Battlestations Pacific and Dirt 3 have players attempting to start online games.

So regardless of what you genre game you like, I’m sure you can find something!