I know a young "lady" who was engaged to a younger man (some might say "boy" - he was 19) who wrote an "angrygram" to her future mother-in-law about how when her son became a husband he would cease to pay attention to mom, because mom didn't or wouldn't do, or was about a dozen and a half things, mostly insulting and largely stupid. Mom showed the note to junior with the intent that he should "see the kind of person he was marrying" and you know what? He called off the wedding.
Not exactly Bridezilla-worthy, but it makes me believe that the show is largely accurate. There are some right crazy people out there.