The series premise is that Tudyk and Fillion are actors who attained sci-fi fame through a short-lived television series. Fillion has gone on to other Hollywood successes while Tudyk is stuck doing the B circuit, usually SF conventions and signings for fans. The show was advertised as being a humorous look at this particular slice of life.
It's not. It's painful and awkward and not even a little funny. Tudyk's character is simply a douche and there's very little amusement in watching him be rude and unpleasant to everyone. You can also play "spot the celebrity" - there's Wil Wheaton, there's Felicia Day - which is amusing for about ten seconds.
To be fair, Tudyk is not making fun at the expense of SF fans. It's not a "let's point and laugh at the nerds" thing. It's just that his character is an awful human being who mistreats pretty much everyone and has no sympathetic side. I made it through four and a bit of the seven currently released episodes and decided I had better things to do with my ten minutes. I just couldn't muster up enough "I care" to go on.
Maybe if you're an ultra-fan of Tudyk this is for you, but otherwise give it a pass.