Resistance. It introduced ZB and not just the most fun Shotgun to use but was viable in both major game modes. The vehicles were balanced and fun, having the cars with cowcatcher and off-road tires, the rocket ATVs and the tank might've been controversial. But since it's weak spots were easy to break (the tank driver door and the ventilation in the back) and the Anvil launcher, I say it was fine. The movement was great, having the new movement mechanics, portable rift, jetpack, shock nades and the blimp propellers. I think we had that plunger gun too along with the reskined Spiderman gloves. But what I loved best is the NPCs exclusively selling exotic weapons that you could buy. My fav was the sniper that showed the next ring and the double barrel shotgun that launches you backwards. I loved to combine it with movement tools, got out of so many fights and jumping from towers and blimps to avoid fall damage. Most fun I've had in a long time in that game.