I personally enjoyed all 4 seasons.
My favorite season of course is the first season but that doesn't take away from the following seasons. This is one of the few shows that still manage to scare me. I'm a big horror fan and stumbled upon the show a few years back.
The scary parts aren't cliche or cheap. The filming allows for build up and "keeping you on the edge of your seat". Also plot twists are refreshing and unexpected. There are some plot holes but still a solid show. The makeup and costume is great, really scary! Overall really recommend the Channel Zero.