I personally never liked it. All the characters were deeply unlikable and a lot of the jokes are just disgusting shock humour. When I used to live in a shared house, I always skipped it if it was on the television.
When I moved to the UK early 2000s I could understand but can't appreciate that type of humour. I think its rooted in culture. Luckily that was the golden era of British comedies and there were great diversities so you can pick and choose what flavour you like.
You'll find people saying that about every era.
If you watch Today Today or Brass Eye, unless you grew up at the time, it isn't funny. Most people under 30 won't know who any of celebrities are in the show.
I don't like any Mitchell and Webb stuff and don't particularly find either of them very funny.
David Mitchell's (at least on panel shows) brand of comedy is just doing a stupid face and making sardonic/cynical remark which is often some thinly veiled political jab, that the target audience often already agrees with. That isn't comedy. It is activism. Once you can see it, you can't un-see it and I find nauseating.