People who say that a show is crap when it makes so many people laugh and has become so popular throughout the world clearly lack an understanding of humour - I'm not saying that they lack an understanding of their personal preferences for humour, but they lack an understanding of how other people can find things funny. I'd say that puts them down as lacking rather than the rest of the world.
Friends is an insanely good show. To last that long and still manage such a following is immense - how many sitcoms have managed such a thing? So, so many shows have tried to emulate such a group of friends but I can't think of a single show that has succeeded without relying on them working together to allow for some kind of twist, be it the office environment, the hospital environment or something else. The characters in Friends were the entirity of the show, and they were hilarious. The mixture of personality traits, the way they interacted and as Miriel put it, the endearing qualities all just made it perfect. That's a pretty strong word, but I have to say that it really was perfect. Would I change anything about any of the main six characters? No, not one.
I know Americans love their Seinfeld and some love their Frasier too, but I'd say that Friends has them both beat in a big way.
I can't really think of which episodes are the best. I've always been fond of the following quote, though...
'SUP WITH THE WHACK PLAYSTATION 'SUP!?