We've seen this all before of course. Infected people infect the I infected and society collapses etc. It is done very well here although there is a flaw that I fear it will not be able to overcome. That flaw is they unlike in the video game, the main characters cannot die. This means that there is no tension to propel the plot along as you are aware that what ever is thrown at them; however tense the music gets; however much they scream; they WILL get through this. After all, if they don't the series ends. The interest so far (episode 2 as I write) lies in how the infected are portrait. So far we have had couple of good descriptions and a "cauliflower head".

So, a solid survivor plot with no real peril. It's hard to see how real tension can be generated here.