I think overall the show was good. I did not play the game but I did look into some of the grievances of people that did and the biggest two complaints were mismanaging time and lack of mushroom zombies. I mean, considering the world is meant to be infected, the seldom encountered them which did seem odd and there were two episodes, that while I think were well written, didn't really add anything to the story and sort of wasted time when they had so much more they seemingly could have shown... like more mushroom zombies.
I already know the main part of the second one that is going to piss people off and likely cause a lot of people to not even bother watching. I am not sure if I will bother with it or not yet. Overall though, I enjoyed this first season and for what it is worth, I think they did a good job.