WG7 certainly was. Can you just imagine, the excitement of seeing a Castle Greyhawk supplement only to be filled with epic levels of disappointment/rage when the actual adventure is seen?!?
So, let me put this into appropriate context.
Castle Greyhawk ... those dungeons ... that was the white whale of early D&D. It was the holy grail.
I mean ... people knew about it from Dragon Magazine, and conventions. So for over a decade, it was the single most desired thing in all of D&D. Period.
And after Gygax was forced out (which wasn't really explained very well), there was this release. Suddenly, the consummation of years of hope and desire, on the shelf, ready to be bought and devoured. And instead, not only was it a (bad) parody module, but it also contained some not-so-subtle shots at Gygax, et al. In other words, not only was it not the product people had been waiting for, it was a joke product- and a mean-spirited one at that.
I think the best way to think of it is this (imagine there is no internet to warn you):
Imagine you're a GoT fan. And one day, you see
The Winds of Winter at the bookstore!
And you bring it home, and you start reading it, and you realize that (1) it's not written by GRRM; (2) it's a bad joke book that has nothing to do with GoT, and instead is a bad parody of reality TV (or something else); and (3) it's making fun of GRRM in a mean-spirited and not funny way (say, by making jokes about his weight).
That's the rough equivalence of WG7 at that time.