There are things that must be said. One of them is: there are really bad books out there. Of course, you knew it. There is nothing wrong with that. I'm afraid their authors have no idea their books are bad.
The only trouble is: they disguise as good books and we buy them in false belief we will enjoy them. We will not but by then it's too late and in case of e-books there is no way we can get our money back and show the author what we think about their creations.
The blurb sounds good and interesting. The excerpt is funny and looks like it's worth the money. Wrong. From the second chapter on you get a ridiculous plot, characters that don't have any character, new characters that pop out of nowhere (like, "Oh, this is my brother. What, didn't I mention I have a brother? Well, we've been estranged for years.") just because the author realized he needs a character to say or do something.
It pisses me off because I paid for a book, for a story. All I get is either some wild fantasy about a perfect world where everyone is happy about the protags' sexual orientation, or badly written filling between ridiculous sex scenes.
End of rant.