HAWKEN is a fantastic flurry of metal, carnage, and sheer energy. The game fills a niche place in the market to be sure, but that dosen't mean you shouldn't try it.
The Good: GIANT MECHS WITH GIANT GUNS!! Really though, it's Michael Bay the Video Game. Huge mechs duking it out across a bunch of different maps. There's a whole host of mechs to choose from, depending on how you like to play. This game is NOT PAY TO WIN. IT JUST ISN'T. SO STOP SAYING THAT. Everything related to gameplay can be unlocked with in-game credits. Mechs, items, internals, the works. The only thing you have to pay for is swag, like paint jobs and different chassis.
The Bad: The previous devs (Adhesive) shut down, and left the game in limbo. Then Reloaded came along and picked this game up from the ashes. This just happened recently, and Adhesive really screwed the game up, so there's gonna long turnaround before the current team can actually release anything new. In the mean time, some balancing needs to happen, but nothing soulcrushing. This game plays like an arena shooter (UT04 for example), where the fast and maneuverable live. Not that this is bad, it just means there's a pretty strong learning curve.
The Ugly: Again, Reloaded got the short end of the stick when they got the game from Adhesive, so there's a host of bugs and balances that need to be worked out. There's stuff in the works to be sure, but it may be a while before we actually see any of that happen. The learning curve and grind have also been known to scare people off.
TL;DR Big machines, big explosions, big fun. Reloaded is stuck in the mud for the time being, but the game is still super fun. Also, check out the forums at https://community.playhawken.com/
These guys are super cool. Very welcoming and willing to help out a new player in need.