Map skills aren't going to do SHIT in CoD, because:
a) You don't pick up weapons from a silly peashooter like most shooters. You start with two weapons of YOUR CHOICE.
a.5) because of this, there is no need to pick up weapons unless you run out of ammo (and don't have Scavenger). This isn't Quake 3/UT99/etc. where you HAVE to run over a weapon to pick it up and get a better advantage.
b) Map skills aren't useful except to get to some places other players can't or to flank. The person that has played longer has a
slight advantage on that front. But it shouldn't take more than maybe five-ten minutes of playing a personal/private game to run around the map and explore it.
! To suggest it takes "skill" in CoD for most things is pretty laughable. T
he game practically encourages camping to get Nukes and killstreaks. "Skill" comes in from running around and quickly taking down players with three-four bullets.
Again: CoD kills are fast. It's a matter of aim-shoot. There is barely any "skill" involved with the multiplayer. I'm sure I'll be ate alive for this, but think about it. Map control isn't important except in S&D/Sabo/HQ and that's to CAMP the spots to kill other players. Compared to Q3/etc. where you have to run laps around the map to control the Quad/BFG/etc.
Let's not even get into the slightly unbalanced (and terrible, but slightly less encouraging camping) maps.