BenDover: Ghosts actually didn't have iron sight snipers. They had the marksman rifles which allowed iron sights, but not the snipers. I will agree, though. Ghosts was garbage. Don't let Infinity Ward's mistake keep you from buying SledgeHammer's first try. I think AW is going to be one of the best, if not the best CoD yet.
Oracle: I think you're looking at the maps in a public match standpoint, correct? As in 6v6 where everything in the game is allowed? In that case, I can understand your point very clearly. Unless you're playing with people you know and that know how to strategize, you're going to get rushed by SMG's on a lot of maps. The contrary to that is that if you're playing "competitive" CoD with the weapon and equipment restrictions, as well as 4v4 instead of 6v6, it's a different game. No matter how small or how SMG dominant a map is, there is always a place to fit in an Assault Rifle to hold down a lane. Even in the map Megacash was talking about, Shipment. Known as the smallest, and most chaotic and sub dominant map in the game, it still has room for AR's. The crates are laid out in a grid pattern, so you can hold down an entire lane with an AR (particularly the lane with the highest traffic) while the subs run through the other lanes, clear them out, and then push through and slay the rest.
When you get down into the 4v4 competitive scene, there's usually 3 competitive gametypes and 5 or so competitive maps. Most often, the gametypes have been Domination, Capture the Flag, and Search and Destroy. Each gametype is played differently. Like in Domination you'll find more SMG's at the start of the game to get the middle flag and establish position, and once you get the middle flag you'll have a few people pull out AR's to hold cuts and defend the flag. In Capture the Flag, you'll again most often see SMG's off the start in order to slay out and make an effort to get the enemy's flag. Once you have the flag, however, someone who died trying to get the flag could pull out an AR before they respawn and watch over the flag runner from a long distance in order to more safely guide him back to your home. SnD, as you probably know, is much different. This is the only gametype where weapons like snipers and shotguns are used very frequently in competitive, because you only need to kill the guy once in that round, so you're not going to run into multiple situations where you're stuck close range with a sniper or long range with shotgun. SnD is all about holding cuts, which is most often used with a sniper or AR, regardless of the map. Maps do not dictate weapon choice in general when you're referring to SnD. Which you still have people running SMG's to rush up and catch people off guard, and people running LMG's to hold cuts and prefire through walls to check if people are planting the bomb and such.
My point is that public matches are very random and I have a hard time seeing why anyone would play the game if all they played were public matches. I personally cannot stand playing them for more than a few games at a time.