AHOY !
The game was initially fun, at the beginning you'll have a lot of upgradable parts and equal opponents, as time goes by opponents are getting stronger and PVP is no longer competitive but unplayable. You are no longer able to keep pace with the other players simply because the game has a limited fuel essential for your further progress and new parts.
In order to get more fuel you have 2 options:
OPT 1. Wait till your next birthday until the fuel bar regenerate itself again.
OPT 2. Pay with real money, and use it for a "slot machine" based system which gives you some random parts that are 95% of time just useless
So I decided to choose Option 1
But I was wrong, the game will annoyingly get new updates that gradually change the rules, subliminally making the game for "FtP" players harder to progress, and even make certain items obsolete
Conclusion:
At some point you'll realize that even FarmVille can give you more adrenaline rush excitement than this game.
My rating 1/5.