The open world was even better if you played the hardcore mode. No auto aim and you only appeared on the map while shooting or running. It was amazing. You could literally hide in plain sight and you were always on edge because you never knew who was real or an npc.

My other favorite part of MP was the unique co-op missions. Even though they were designed around 4 players, a friend and I managed to get gold on all of them. Such good memories.

Hell, one of most memorable trophies comes from that mode. 2 Guys, 1 Coop. The other was from the Undead Nightmare horde mode. Smoke That Skinwagon. If I remember correctly it was almost impossible to get but my friend and 1 random managed to surpass wave 15.