I read those stories as a kid (we had a huge single volume for some reason) and tried to figure out how to emulate Holmes' thinkings so I could be as smart as him (and not be the hapless Watson). That resulted in quite a bit of time in the library chasing things down which caused me to learn that things in books aren't always true and that adults were often idiots. So I can't say that reading Sherloc Holmes stories were bad for me, but the process destroyed any interest I had in anything Holmes related.