Quite underrated game to be honest. Sure It's pretty simple like the graphics and stuff but it still holds up. And yes it does lack a bit when it comes to content like world events, weather or hordes etc.
The game is growing and it's much better now than when it was released. And the game is FREE so what do people expect from a free game.
Sure it got some flaws and some bugs but nothing game breaking.
The only thing i don't like is the co-op option. I want to play with my friends in the ordinary gameplay immediately, not when you are high leveled on some special places. Really bad game decision.
Other than that it's pretty fun and i recommend it.