Earlier quoted context omitted.
A movie adaptation of a book is a retelling of a story for a completely different type of audience, so it's an apples to oranges comparison always .
There's a difference between adaptation; and retelling the story in a way that damages the integrity of the original. Many of the above changes don't make sense even within the movie's own material. Even if the books didn't exist, Faramir's filmic story arc (as just one example) would be a badly executed example of character development.
And even changing characters somewhat but still having a development or purpose is arguably fine - it's the changes that aren't good in the context of the movie that are most baffling, especially considering the dedication shown in other areas of the films.