I'm a huge fan of Python but I understand the TV series is a little hit 'n' miss. You have to remember two things:
1. The period. This kind of stuff was so new and fresh and funny back then - nothing like it before, except maybe the Goons and Milligan's always been a point of praise from the Pythons. And nothing like it since, except maybe my personal epiphany The Young Ones. But while The Young Ones had an exploding fridge - an exploding fatso? And while Vyv had his head knocked off by a train - getting your liver ripped out in the name of science? Love it.
2. The sheer amount of material they were knocking out. I love shows like League of Gentlemen and Little Britain but they're essentially the same characters repeated (that's not criticism, it's a fact): Flying Circus was always new, always different. Rik Mayall said he loved their ability to not necessarily shock, but to surprise - and that's the key element he wanted to bring to sitcom with The Young Ones. You'd watch it and it could turn into a sketch, song, animation, anything.
So yeah, I'm a fan.