Fair play levels aren't so fairplay. After one play, all computer players start to do all vs 1 on you. That's kind of bad situation for player, who lost his/her first Fair Play battle.
Game is dead because of "matching", the game won't match you if there aren't at least 40 players. Best idea to solve is to make table game setting(you make a table which means you want to play, and someone joins you and the match starts).
... This is stupid when someone keeps killing you and you kill him and no one can win for like 20 mins... I love this game, but when i spot dumbaskt or somebody else who I noticed i refresh...
If you are doing Mega Area tower, put one Sniper into it so it would have 540 range. When Mega Mega'ing it, it's Ghost Splash, Machine, Splash, 3 Area towers( Slow, Weaken and Area), Sniper and rest Damage (may be also 2 Fire rate) :) Hope that can help in planning your battles.