The game is a gamble, you can play for free but it's not fun unless you throw money at it.
It's hard to explain what I mean, but basically the game has bad fps mechanics but the fun in it is spending real money on PED to buy ammo/weapons/armor and then using those to kill things and possibly get a huge random reward. I thought the game itself was....shallow and stupid...in fact I'm tempted to not even call it a game lol but feel free to give it a try if you so feel the need.