Further proof of the casualization of the FPS genre without mentioning multiplayer with recharging health, kill streaks, a level system rewarding time investment as opposed to skill, and on.
This post has me thinking when did this simplistic map design start?
Personally, my knee jerk reaction is screaming Half-life, but even in Half-life the indoor levels were labyrinthes.
I am going to pin the blame for the casualization on the first Call of Duty as it started as a scripted immersive experience as a soldier on the shores of Normandy. Yeah, Call of Duty is to blame.
As for Halo, even the most simplistic outdoor map in Halo makes the most complex Call of Duty map (pick a game from Call of Duty to Black Ops) look like a straight line from A to B.