This. The majority of the maps are too tiny with way to many tight corners and clutter. Even Turbine, large though it may be, is fairly tight.
I understand where you guys are coming from on this. However, there are maps with large open spaces to go along with the tight corridors. Drone, Cargo, Downhill, Carrier, Standoff, Aftermath, Express, Meltdown, Overflow....
Raid, the smg paradise, has open areas as well. Just avoid the trenches in these maps and you can play longball
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You should be playing to your weapon's strengths. I primary rush with an assault rifle, so I try to patrol areas of the map with long sight lines. I stick to weapons that are capable of killing in three shots (MTAR, SWAT-556, AN-94) so I can still compete with SMGs in CQC, but they have superior range and will outgun SMGs in most ranged engagements.
For those rare games where I do use a SMG, I try to force CQC engagements. With assault rifles, I usually take corners widely, aiming down sights while strafing; with SMGs, I prefer to hug walls and stay as hidden as possible because I know SMGs are at a huge disadvantage as soon as they require five shots to kill. I'm also trying to flank the enemy and get uncontested shots in the back for easy kills.
Honestly, the key to Call of Duty is dictating the gunfights. If they occur on your terms, chances are you will win.