Is VII de magical number (sequel) for an RPG?

Of Final Fantasy, Ultima and Might & Magic I hear often that the seventh installment was the best/high point in a series. (Not a universal opinion ofcourse, but I do read it a lot.)

Ofcourse VII was reached by these games in respectively 10, 12 and 13 years, so it might actually be more due to experience of a developer than sheer volume of sequels.

With exception of partially playing FFVII, I haven't had the pleasure to experience them. Time to brush up on some RPG history, I guess.