I love Archer, and started watching it when it premiered. I love the humor, references, and the story. I love how I would catch jokes after many re-viewings that I missed the few first times.
I have watched the first 4 seasons probably a dozen times, maybe more.
When Archer Vice started, I still watched, but I don't think it was as interesting as the earlier plot lines. I have probably watched seasons 5-7 maybe 6 times, and when rewatching the series, sometimes I stop in these later seasons and don't finish, only to start back at season one a few months later.
Starting with Season 8, Dreamland, I have started to lose interest. I stopped watching them as the episodes come out, and just wait for them to be on Netflix or Hulu.
I haven't seen season 10, but judging by the (predictable) intro to it in the end of season 9, it might be okay. I just hope it gets back to the classic style episodes that I love.