http://www.vox.com/2014/9/29/6857745/friends-ruined-TV

Pretty people being funny

It's hard enough to find funny people. Once you place the restriction of also having those funny people be attractive, it gets even harder

Rise of the twentysomethings

That disproportionate focus on one particular type of comedy choke out lots of other promising types

Ross and Rachel and Monica and Chandler

"Now, we expect character relationships to be constantly evolving."