You know, it's funny. I remember getting pissed at Friends when it was first shown here in the 1990s. (Here being the philippines). I mean individually, the characters were funny but yeah I felt that they were getting repetitive and stagnant. That was then.
Recently, out of boredom, I borrowed a friend's Friends DVDs and ran a marathon (am up to season 9 now) and for some reason my wife and I enjoyed it more now then before. Maybe because, being in our early 30s, my wife and I had indeed gone through more of the Friends' experiences such as problems at work, paying the rent etc.
Yes, Friends is more than just preggers and the "break" I agree that you can't just watch "selected" episodes.
BUT
I still don't like it as much as Everybody Loves Raymond and Frasier. There are just more levels of humor in those two. I'd tie Friends with Seinfeld, though.
And I don't agree that one episode can give you a feel for the show. Some episodes can be outrageously good and others maybe sub-par. And I mean this for any given show.