I don't really care if the review is great or bad because I have been having countless hours of fun with my friends on multiplayer and we started off with beginner level and then moving on to hard level currently. So actually we are playing all the missions again with a harder difficulty level and surprisingly, we are still enjoying it! And once you are done with the missions, you can change to the horde mode and there's easily about 1 hour of enjoyment as well, well that depends on how good you are and how many waves you can last.
But that satisfaction when there's simply a swarm of zombies and you just unleashed all the ammos you have with you and killing every zombies in sight, that is purely satisfying indeed.
I hope in future the developer can add in options such as having the player driving a train, car or even helicopter while the teammates focus on killing more zombies along the path, that will definitely add new varieties to the game and keeping it fresh for more rounds replay of the missions.
Easily 7 or 8 out of 10 at minimum, but I'm giving it a 5 stars considering the hours of fun I've had on this game.