its free,
but not for me.
the games are fast, but the action is slow
waiting at a good spot is basically all the tactic I can imagine - and that would be enough to be entertained for some time, but the game lets u chose from three shit tanks, and offers u to buy better ones for real money or to grind with the shit tanks. Grinding money with shit tanks is no fun for me.
Lately no game can satisfy me. Even Portal 2 was a bit of a pain when I got close to the end. Only Shogun 2 kept me all thru the campaign.