Rock, Paper, Shotgun did a review of the Early Access version currently available and came to the conclusion that it's a great game marred by grindy leveling and microtransactions.https://www.rockpapershotgun.com/2016/09/19/crossout-review-early-access/
Put this editor together with the rampant combat and you’re left with a rough and tumble action game with tons of potential. It’s wonderful. It’s creative and brainless. It’s Besiege meets World of Tanks.
It’s also one of the grubbiest grindfests I have ever had to play. And this is where Crossout starts to fall apart.
I cannot emphasise enough how much of a shame this is, because the actual game buried underneath all this nightmarish grind-goop is excellent. Build a weird apocalypse car and go to war in it? Yes, please! If only you could make things like those shown in the exhibition tab without jumping through all these disgusting hoops. Some hoops? Fine. But not these hoops. These hoops are rotten.
Although, after reading several of the comments on the article, it seems like the author is a bit off, since the game doesn't actually have any way to buy currency right now so there are no microtransactions. It's all in-game currency. And the in-game market is a player-driven economy, meaning players are setting the prices and you can buy low, sell high and make money that way if you are smart.
That means the grind may still be bad right now, but it's not [currently] there to bleed you of money. Probably will be once it goes free to play, but there will hopefully be more balancing before then.