Have to agree. I liked Friends until they decided it was more important for parents to pursue what makes them happy rather than their own kids, but Seinfeld was funnier. Also, I haven't watched live tv since I was a kid, really don't watch much else either, but I bought the entire 9 seasons of The Office. My wife and I watched it at least 4 or 5 times and I still will get sucked into an episode if someone else finds it on some channel. Funniest show ever and it never gets old. And this of course is obviously not just my opinion, but fact.
As far as Friends goes as a Lego series . . . I have no idea (nor care to know) of what the marketing research shows, but it was still hugely popular and continues to be. Hard to figure which hugely popular TV show would be done in which order but I'm sure they've done some research. I'm just rambling here because it's 4:30 in the morning and I haven't been able to sleep, but other than for investment purposes I have no interest in any of these tv sets. To me they just aren't very display worthy compared to a Millennium Falcon, rocket ship, Mustang or a modular city.