Re: To Kill a Mockingbird, pretty much every book with a child narrator seems inconsistent in its use. I think most authors use the idea of an adult narrator looking back so they can apply an adult's perception whererever it suits them. It was exactly the same in Spies. I agree with brad-dyrak that it's the tone and reflections that matter - I think To Kill a Mockingbird's greatness is all about its portrait of a father figure that's crafted from that.
What was so irritating for me about Spies was the way he uses that child's perspective to describe events through some really annoying metaphors, then proceeds to repeatedly hit you over the head with them in the most unnatural way. Admittedly it's made 10x more annoying by having to study the damn thing, but the whole book is him leading you on the most tedious of routes, dropping giant-sized breadcrumbs to signpost what's really going on. I was told that the opening's one of the best recreations of a certain childhood, but unfortunately that was lost on me.
Salinger's my favourite author, Catcher in the Rye my favourite book, but I think Dan Schneider kind of nails it talking about the cultic quality of his work towards the end of
this review (of Nine Stories). I disagree with him over why - Salinger's the best expression of the feelings of never coming to grips with adulthood that I think some people never do grow out of. If you feel like that while reading it, then Catcher is a great book. Eboue talked about maturing and seeing it for what it is, I just haven't experienced that yet. I'd never try to convince anyone else of the greatness of Salinger's writing because it's probably not the case (pretty much all the criticisms in the article, stand, I think) though I do think he is a great observer of people - take the opening of Franny & Zooey with the movements of all the college kids waiting at the station for their dates. But the criticisms of his writing don't seem to matter because of that cultish quality, the personal meaning it has to me, the communication of something I've felt that I might not have been able to articulate, myself. That for me is more what art's about over any kind of objective criticism/ranking of it. Which is maybe a viewpoint I'll grow out of, one day.