It's go time:
Afghan: 9
Can be a sniper's haven but has enough cover and elevation for people to flank them. A solid map for almost all game types.
Derail: 9
Another one of those maps that would seem like a sniper's haven, but again has enough junctions to make it interesting for non-snipers like myself.
Estate: 2
Pretty horrid map that's hard to see people on, and gaining control of the cabin is pretty much an insta-win for the team in it. I hate this map, but it sure is pretty (and a great design on paper...ugh).
Favela: 8
Can have a bit too many rooftops, but it's easy to flank people on up there as you run around the map. Quite a bit of fun.
Highrise: 8
Solid, fun mini-level that has a decent number of routes to create an exciting round.
Invasion: 6
Fine map, but I never really have much fun with it. It's pretty much entirely ground-level fighting, with little cover. You can get a good amount of cheap deaths here with people in the embassy/roof.
Karachi: 9
Frantic map with no place to hide. I love this one...you have to keep moving or you're pretty much dead. Camping spots are readily apparent and are easy to flush out,, and the close combat calls for some shotgun/riot shield action. Fantastic map.
Quarry: 7
Alright map, again, haven't really had amazing battles on this one but decent enough to stick around for.
Rundown: 8
A very unpredictable, confusing map that really serves the thermal/airstrike teams. Can be easy to get sniped on but it's chaotic design keeps the action fresh.
Rust: 9
Cmon, if you can't appreciate this insanely small map...then you shouldn't be playing this game. An absolute blast on FFA, but deduct 8 points for any other type of gameplay mode.
Scrapyard: 4
Too small, and too easy to gain complete control over certain areas of the map. Reminds me of MW1 maps...which is a bad thing.
Skidrow: 10
A great indoor map that eliminates nearly all killstreak bonuses, resulting in some pretty intense indoor firefights. Fantastic map.
Terminal: 10
Another one that has a ton of junctions for people to get around in, plus has something for everyone. There are danger zones that rewards players for using (the long hallway which leads to anywhere the player wants to go) and there's no choke points, which is crazy. Fun fun fun.
Underpass: -
Haven't played this one enough to form an opinion on just yet. I like what I've played so far though.
Wasteland: 7
This can actually be a fun map when teams are trying to take control of the center underground trench (happened in three instances, and MAN is that fun) but is horribly un-fun when playing as a sniper's paradise.