Mh, I've had my share of fun. It's an exploration game, first and foremost, with a bit of robo-biffing and upgrading on the side. I don't regret the purchase, but you probably should consider the following points:

It's a bit like NMS in that you're thrown on a planet with little direction beyond "help the surveyor bots and scan things for info". Hell, it even looks pretty similar to some of the planets I've landed on in that game (sadly, sans the giant wrecks strewn around...). You spend most of the time tromping through the tundra, looking at strange things and pondering where to go next.
If you don't have a sense of wonder to appreciate the alien landscape (complete with half-buried wrecks, giant metal skeletons and other awesome-looking floatsam), you probably won't enjoy it.
It's not really heavy on the action or a hardcore survival sim. It's a walking sim that happens to have some nice shooting on the side.

It's also rather short. A playthrough will take between 6-10 hours, and then that's it. The map is static, the skirmishes between bot factions mostly concentrated on the last area. There's also no free roam after the game ends (the why of which is pretty clear once you've seen the endings themselves...).

thanks, I dont mind exploration games :)