Season 3 is bonkers good and has one of my favorite back to back episode sections in television history (Season 3 Episode 5 Runtime Error and Season 3 Episode 6 Kill Process, rivals things like S6 Episodes 9 & 10 from Game of Thrones). Season 4 is maybe the best final season to anything ever. Has both my favorite television episode (Season 4 Episode 7 Proxy Authentication Required) and also has one of my favorite series finales in it (Season 4 Episode 13 Hello, Elliot). And I don't even think I'm really the target audience for the show. I honestly think I should have liked it more and it's like 2nd on my list of best things I've ever seen.

For what it's worth, everyone should definitely watch the show one time through for Proxy Authentication Required alone. It's the greatest payoff to something you didn't even know you needed and it was built to throughout flawlessly while being right under your nose the whole time. If you care about IMDB ratings, that episode had a perfect 10 rating for like 6-7 months after it aired.