I find more modern American humour much easier to relate to, probably because it has veered more in this direction. A show like Always Sunny seems incredibly British-compatible because it's about terrible people getting their comeuppance, yet still being sympathetic despite their failings.
I only watched the first few seasons of IASIP, but I don’t remember them being sympathetic characters at all. The whole concept, and what made it funny, I thought, is that they really are all terrible people who just drag each other down.
Yeah this does seem right. Maybe as our own empire has been collapsing, our culture has been edging toward the brits'.
To go full British, you need characters like David Brent, who aren't sympathetic. They have no redeeming heartfelt goodbye. No-one is sad when they're gone, life moves on.
I would also say that the Always Sunny gang really aren't sympathetic either, but it's a para-social trick of having spent so much time "together" with them over so many episodes.
I suspect a new viewer coming to watch the latest series of IASIP would not see them as sympathetic. That's quite different to The Office (US), where a new viewer skipping to later seasons would not have the same opinions as a new viewer watching season 1, where Scott was much closer to a Brent type character, before he was redeemed and made more pitiable than awful over the seasons.