From a campaign perspective, the modern warfare series. Couldn't weigh in on multiplayer if I wanted to. BLOPS had it's moments and plot twists... But the flashback style of storytelling always made me feel like they didn't have time to make complete missions, so they just cut in and out of action sequences. Ultimately, Spec Ops: The Line probably takes the modern shooter award for best plot. Despite being yet another rehash of Heart of Darkness.