Each of those shows you mentioned are audience sitcoms, not laugh track sitcoms ( though they may employ additional laughter from a laugh track for sweetneing, or maintain continuity). There really aren't good characters anymore these days, which is one of the points I've made in the past, and this is a common complaint about TV today, is that most characters on TV today are unlikeable jerks who care nothing about what conflicts they may cause or who they may wrong . . . and that was even a complaint about this show for a while, that the characters were "too mean." The networks are even admitting right now they want another Archie Bunker on TV. That's because sitcoms in the past were well-written: as outlandish and silly as many of them may have been, they were at least solid and had entertaining stories with engaging situations that were genuinely funny . . . writers today always go for the lowest common denominator when it comes to humor because they just want to get as many quick, cheap laughs as possible, hence why we see a lot of lowbrow, juvenile, toilet humor on TV and in movies today. In fact, TV critics often SEINFELD as being the last truly well-written show TV ever saw; I can agree with that - I've seen very little on TV since with structured storytelling and engaging characters, with the possible exception of EVERYBODY LOVES RAYMOND.