1. It managed to run for ten seasons without getting boring.
2. It had non-stop funniness in every episode.
3. When the last episode ended Ты wanted to cry.
4. Ты feel like you're one of them.
5. They're not always predictable, unlike some other shows.
6. There's so many different ideas.
7. Their chemistry is GREAT.
8. Ты think you're going to die laughing at it.
9. Ты don't care how many times you've already seen each episode.
10. It can be extremely like real life.

This is only ten I can think of many more...