People loved Friends when it was on the air. Some argued that towards the end of the show, the actors outgrew their characters, but they still managed to get through fairly well. With a reunion series, viewers would be able to gain a sense of closure and gain insight from a whole new set of problems that result from becoming older.
There should be no "Friends" reunion because it was a terrible show. I'm far too young to have been seriously into it, mind you (I'm 24), but even if I was old enough to have been in the demograph that watched it in the 90's, I still would not have liked it.