You can indeed purchase a couple things with real money, however, you can also get stuff without paying with XP you get for participating in matches, but at a much slower rate, quite similar to the LoL in that respect. Pretty much all of the unlockable weapons for the classes are side-grades with no huge overall advantages over each other, i.e. one weapon would be more useful in one situation than in another. Also, you still have to “upgrade” the stuff you unlock with XP to get the most out of it, so people who pay to get weapons and whatnot will have to do it as well. So no, I don’t think that the game is pay-to-win at all.