I enjoyed the original 3 seasons, although the Rita arc felt a little weak to me.
Season 4 was weird. Firstly, everyone was older, obviously, which made a big difference for George Michael and Maebe. I also thought they dumbed down the Michael character to make George Michael the sane one, at least to a degree. The Lindsay story was dumb, and Rebel grated on me the entire time (What the fuck is with that laugh?)
Season 5 seems like more of the same of season 4. Except with swearing now? Weird to start that on season 5, especially since they had a pretty good thing going with the bleeps(Really, the insane rant Buster went on about Lucille was hilarious because of the bleeps).
I guess.... to use a TVTropes term, it feels like it's been Flanderized. I think... To be honest I was never 100% clear on what exactly that means.