Catan can be fun, especially the first few dozen times you play it. But it wears thin even for a casual group. We have better casual games these days. And even back then, we did: I found that eg Bohnanza released about the same time as Catan holds up much better to repeated plays; even though it looks much less impressive at first. The big problem with Catan is that the initial settlement placement determines so much of the rest of the game, and there aren't that many meaningful decisions left in the rest of the game.

I did most of my in-person games of Diplomacy when I was working in Cambridge, Cambridgeshire. I was working for a startup spun off from the local university, and noticed that the university societies were actually (mostly) open to the general public. So I just joined the Diplomacy society.