I can guarantee you that if they released opened up maps, people would start complaining about them turning into campy snipe-fests.
Smaller maps make it rush twitch fest with too many corners and is exacerbated by the latency meaning whoever goes around the corner is going to get the kill 90% of the time
With larger maps, you gotta think about your movement, post up in high positions and lock down. It's not only more tactical, but IMO infinitely more fun.
The greatest thing about MW2 maps was going upstairs. There are multiple maps in BO2 that are pretty much entirely flat, slums for instance, and two buildings facing each other for sniper wars doesn't count, so plaza, meltdown, hijacked, etc. Are right out too.
It's just so boring now.
Petition to bring all the Black Ops 2 DLC to Wii U! Signatures : 1