>>268669065
Gamemodes and maps, simply. There's a ton more variety with guns and they're generally better balanced than anything in pavlov, movement and IK is much better, ammo is actually limited and reloading is more involved and there's no bullshit mechanics like the "helmetbleed" of pavlov.
It all falls flat because the gamemodes suck ass, 5v5 on huge maps that give massive advantages for just being slightly ahead of the opposing team in control and extraction, gun game for some dumbass reason has teams and bounty hunt devolves into whoever gets a lucky pistol kill before the round ends because pistol kills give half the points of whoever you killed to you.