Why does everyone want more players? I don't want to try to communicate objectives and commands in Team Deathmatch to 15 other people on my team. Its hard enough to get 7 other people to respond and play together. 8v8 is just fine with me.
I also think that trying to dodge sniper fire from 10 guns at the same time doesn't sound too fun. You always have half the other team sniping. 4 snipers is enough.