The third book of the trilligy.. but not the end.

Brisingr! Oh i am annoyed with Christopher Paolini!! First off, fail marketing wise, he took too long to come out with book three all the anticipation died. Secondly, the movie that came out, FAIL, it was nothing like his books so instead of turning people on to the books i know a few kids who hated the movie and decided not to read the books. The third book however did not disappoint, i enjoyed it even if it just kind of ended abruptly. I cried at a few points so I was very enthralled. The book was good but deep down i expected more. With Harry Potter we all knew we were getting into a seven book series but I only wanted three books on Eragon and his adventures. Now though the story isn't over yet so I will read the next hopefully last book but this all makes me sad. Eragon's story is taking a spin for the worse I think, some characters are living happier but most's lives are depressing and a lot are ending. Why do authors feel the need to kill off so many characters near the ends of ther stories? I like happy endings, who doesn't?