Psychological depth in Tolkien's characters

[Eurytus]

As Aiwendil rightly pointed out in the dumbing down thread, Tolkien palces demands upon his readers: that they correlate information about specific characters or scenarios given often in widely different chapters texts or sources, and that be willing to read something more than once [ The Silmarillion is a perfect example of this for many people].

I love the view that it is the readers fault for not seeing the depth in the characters.

I would also point that it is absolutely no defence to state that one should be willing to read numerous sources in order to understand the characters. An author should put all the necessary information in the story itself and not rely on additional (unpublished) sources.