The game is fun at first couple of hours then it becomes repetitive.
I think Fortnite has a potential. Hope the devs listen to players and put more content in the game.
There are minor bugs but they are not game breaking.
The content they brought at the end of the first month is boring. You are supposed to do these base defenses which can last maybe four hours doing the exact same thing.
So to conclude if you like this kind of a game, building your fortress and enlarging then defending it against zombie attacks buy the game. Otherwise wait for it to become F2P.