Never bores you!
entertain me. You keep finding new ways to get to some points and you can always do better then you do now. There is an enormous choice of cars, tanks, plains, ships and other. You can be a sniper, assault, anti-tank, medic or a engineer.
I always play the multiplayer because the singelplayer is quite easy and the AI is not very good either: the bots always go to the same place and react at the same way.
So: the multiplayer is very good and the singelplayer could be better.