Yeah, I recently got MW3 for my birthday a few days ago and I've noticed (despite what they claimed before the game came out), that the map design and spawns in this were just unacceptably bad. It was the first CoD game where I straight up do not like the multiplayer. But I think the worst insult to injury was that the last game in the series, Black Ops, pretty much completely fixed a good majority of the things that are ass backwards in this game.
Boosting in Free for all, the spawning system in most game types, the perk set up, the killstreaks, they all generally worked. My only guess is that there's some sort of inner company feud between the two lead developing teams in which they all try to avoid any major advancements made in each others games. A sort of 1 step forward, 2 steps back kind of deal.
I'm going to give it a few days and I'll reach the end of the first leveling prestige, and if it remains terrible I'm gonna give it back. I made a deal to myself to figure out if the heart aches and raised voices that come out of my mouth are worth playing the game for the occasional shining moment that appears less and less with each iteration (Though I really think that Black Ops did a good job, yet the theater mode made it lag a bit too much)