Did anyone else find this really disappointing?

I really like Nick Hornby's books & I though the film version of About A Boy was as much like the book as could be possible, it dealt with some difficult issues but in a sensitive and humorous manner. But in contrast this film just seem to lack all the emotional content of the book, most of the context was changed. What I like about Hornby books is he doesn't feel the need to have the happy ending, or even an ending sometimes, it just a continuation of life. The movie instead had to have all the conventional plot points, the humour was generally shoe-horned in, instead of natural, I expected it to be more of a black comedy but it just went for jokes, e.g. the fight scene followed by all the black eyes. The amount of exposition in the film was tiring & feeling and actions of the characters were projected by a glorified music video. At the end of the book none of them came to any quick revelation, they just found life more bearable. As a person who has dealt with some of the themes of this film, it just seemed a little too shallow and convenient!
It seemed like a missed opportunity what do you think?

P.S. I realise comparing a book to a film is often folly, but humour me.