Separate servers for all the European countries.
Team work is more fun when you're not trying to understand broken English. I'm sure that other players from other countries feel the same. Must be irritating is there's a load of Russians with one English guy on the team who doesn't understand anything they're saying.
Weapon balancing is a tricky situation. The M4A1-s just got balanced and everyone is moaning about how it's been nerfed and is now underpowered.