The Vice season was pretty crap in all honesty. It wasn't even really an issue with the season's concept, the character writing got really lazy. Pam in particular was grating within 2 episodes of saying "cocaine" every other line, yet they dragged it for the whole season. The only character whose schtick wasn't annoying by the end was Cyril, every other character, even since season 4, has become too repetitive and obvious imo. I have a half a suspicion that it's less that one season, and more that Archer's one of those shows whose style is best when it burns brightly for a few seasons, but otherwise can quickly tip into one note.
All that being said, I haven't seen any of season 6 yet but I'll definitely give it a chance. Those first 3 seasons of brilliance still leave a mark.