War Brokers is a pretty good online FPS that has a number of different game modes like Battle Royale, Team Deathmatch and more. It also has vehicles and a lot of other surprising features.

Very much an indie game though and considering it's Early Access, there's plenty of rough edges. Promising though, one I do enjoy jumping into now and then for a few rounds.

It just recently got updated to add in a Friends system, so now you can search for people and add them to play together. The way it's currently done is a little unwieldy though and would be better if it had a proper Steam integration. Still, it's only just been added and will hopefully be improved.

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There's also now a Spectator Mode implemented, for if you join a full server or a game in progress which is pretty nice. Additionally they've made the actual gameplay feel nicer with a tweak to bullet speeds and the movement/jumping doesn't feel as floaty as it did before.

If you find games like Counter-Strike and Insurgency too serious, this might be a good option with the more colourful blocky style to it.

You can find it on Steam. One other unique thing about War Brokers, is that you can try it free in your browser. The Steam version is much smoother though of course.