My major complaint about the show is that the Dad isn't extremist enough. I think the show would be funnier if they made him more of a cross between Brock Samson on "the Venture Brothers" and Colonel Flagg from "MASH".
There have been a few moments where they hint at that kind of character: when Stan was having a fight with his wife about politics and we later see him on the roof, aiming at her with a sniper rifle, or the time he traveled back in the time with the ghost of Christmas past and used the opportunity to try and assassinate Jane Fonda. But too often they portray dad as simply an amiable goof, not that different than most other sitcom dads.
