I've recently started dabbling with BFV's community games, and have decided to keep my Invasion game mode going.
Invasion is pretty much as Realistic as I can make it, but also still enjoyable.
It's Hardcore, No HUD (Except Name Plates) which can be removed for each individual in their settings should they desire, 200% tickets and 500% playtime, to make for incredibly long games. It's primary focus are the people who enjoy realism, and being with people who also play their roles how they're supposed to. I've found that being in these games, almost everyone is playing like their supposed too, medics are always on point with revives and smoke to help out, assault is always out front smacking tanks, and support and recon do their thing as well.
I just started a new game and I'm waiting for the population to hit so we can start, so if you're interested, go to the community games tab and find "[HC] Invasion Realism [No HUD]"