Edit: To expand on what I mean by community-oriented, here's a genealogy of the different outfits (equivalent of a clan/guild) on one of the Planetside 2 servers: https://cdn.discordapp.com/attachments/887173952080863253/91.... Once you're used to the game mechanics you slowly get drawn into the metagame of complementary or conflicting personalities, outfit history, schisms, cooperation, drama, competitive play, leadership, and so on.
[1] https://www.splashdamage.com/games/wolfenstein-enemy-territo... [2] https://www.etlegacy.com/
But, that's kinda it, I doubt there are ever more than 1k people online at a time. But those same people have millions of XP (I actually have a PR open on the client ATM to abbreviate the XP in the scoreboard, which I think we finally need after 20 years lol)
If you play, make sure you use the etlegacy client, it is backwards compatible with many fixes/improvements.