The lack of a multiplayer mode means that once the 6 hour campaign is done there isn't much replay value. (thezombiechimp.com)
First person shooters are far and away the most popular genre in PC gaming with most including both a single player story campaign and a variety of multiplayer game modes. (lifewire.com)
Perhaps the worst oversight of the bunch is the lack of multiplayer options. (metacritic.com)