No, instead you just read a prequel and assumed it was a novelization and somehow took this out on the book as opposed to realizing you made a mistaken assumption.
Unlike you, I've actually read the book.
The first 75% of the book is prequel material, but the last 25% is the Avengers story. It ends right after Loki is captured and put in the cell.
I wouldn't have a problem with it if they didn't advertise the thing as the novelization of the movie.
There is a big Avengers cover. The back of the book's summary is about the gathering of the heroes and about fighting Loki. Also the book is full of pictures from the Avengers movie.
Talk about misleading!