not pay2win, but pay2notgrindforfuckingever, no think of it like World of tanks, except, that while you started with your loltraktor, everyone else already has their maus' in the same battlefield. Yes, you can grind if you want, but considering it would be easier to put down 20 dollars and buy the damn 1.5 million gold sword rather then put in 400 hours to buy the same item.
honestly, its free, just download it, and come to your own conclusions.