I find that life has many interesting things that people find boring simply because they have a fixed view of them. Physics is like that for me. Physics is something that i do not truly understand enough to master the subject, but I know that if I think something out without really thinking about it then make a conjecture about that thing, then take the exact opposite of the conjecture that I am really quite close to understanding physics.
Holmes does that in a lot of ways. He takes the things that people count as obvious and then discards them. He works with what people have not considered first and then finds that the most common place answers and obvious facts, can really point in a hundred directions. The obscure facts are the one that are fast in finding the answer and the obvious facts fit that explanation as well as the truth.Don't judge a book by it's cover, it is the intricacy of a person that defines them and you will find more often than not fits the obvious facts that you thought were their entire story.