Maybe it's just a naturla evolution of the series, maybe Lorre knew the good parts when he saw it and just went there, maybe it was on purpose to begin with; I doubt the last one, but that makes it pretty unique all things considered. They say that drama means change, but sometimes it can mean comedy too, and it definitely does here.
And yet, I think to a lot of people, the show is still mostly just, that series Allison Janney happens to be on. Hmm. Think about it, it's one of the darkest, edgiest and funniest comedies from one of television's best creators and producers and it's mostly a footnote in today's television landscape. I mean, it's popular, and mostly has had good ratings, it's a Top 20 hit now, and has been a top rated sitcom forever, but it's-, yeah, this show's six years in, changed itself multiple times over and just hitting it's stride, stands out as unique today and from it's predecessors.... It's not right, this show's way too good to be an also ran.