Everyone has an opinion...some of them are informed.
The Mac may not be for everyone. It's not a Swan or a Wally. Taken for what it is, it can be a fun boat for someone.
The kind of comments we see here sound just like some of my motorcycle experience. Harleys are tired old junk. Jap bikes are crap. BMWs are too expensive and Moto Guzzi has been going out of business for 75 years.
Whatever, I've owned and ridden all of them.
People bash stuff all the time, often for very personal reasons that have little to do with the facts.
People have opinions, some of them are informed. It's wise to try to determine from whence the opinion springs; emotions or more objective experience.
As for the Mac, I just saw a movie, posted *here*, just last week, of a 26 our in 50kt winds. It was being sailed with a lot of skill but, it was doing just fine.
And the camera boat was a Mac 75, with the designer on board.
Like someone else wisely said, other very high quality sailboats, never capsize or sink...nosireee...not ever.
It's more about the captain and their experience with the boat and the conditions than the make.