I'd also like to add on to the "it's one of those games" comments. The story is as good as a book, the art is amazing, and the community is fantastic. You don't know until you try it.
I'm kind of scared to play. It looks really cool, and at the moment I am setting turrets, however it is overwealming at how big the place is and that you have all the turrets to start. Better progression would make this game good.
@ MrRubix
Cleary it has some inspiration from those two said games, but that doesn't dismiss the fact that it has it's own unique elements as well. It's worthy of a play, nontheless.
You will find it fun after you get custom to it :)