You should keep three things in mind if you want SDN to be useful.
1. Do not take SDN's opinions on the medical profession more seriously than that of medical professionals you know in real life. Remember that while you are out in the world doing whatever it is you do you are experiencing and learning things and someone's opinion on the internet does not negate those experiences. SDN is a supplement not a replacement.
2. AdComs are people. The adcoms on here disagree about some things and have shown to have their own biases and preferences. In short, they are people. When putting together your application remember that you are a person applying to be reviewed by other people. If you cannot figure out how to appear like a human being then maybe you are not ready to apply. If you consider that the adcom are people then you won't fall into the trap of thinking "who will be accepted between A and B if B has this tiny difference.." or "is it ok if I only take 12 hours??!?" or "should I retake my 36 because WashU's average is 38?!?" Etc.
3. Like the others have said above, do not obsess about numbers. Buy the MSAR, figure out what schools would be a good fit for your career goals AND your numbers. It is good advice to apply broadly but try to have a good sense for the rest of your application outside of simple metrics. Do not apply to a school you do not want to go to just because SDN tells you to. If you would be miserable in NYC then don't apply to Columbia even though you have a 4.0/528. If you couldn't live in a rural area then don't apply to TAMU even if you are within their range, etc. Your application should be smart but not paranoid.
My advice to people joining SDN:
1. Get off SDN.
2. Oh look, you're back you neurotic SOB, now go read
@mimelim's post about being a good clerkship student I forget where it is
Then read
@bluestreak's advice on interviewing:
http://forums.studentdoctor.net/threads/advice-from-20-interviews.980593/
Then read
@mehc012 's Anki thread so that you get an A in all of your memorization heavy courses (aka intro bio, psych, biochemistry)
3. Buy the MSAR
4. Go to the socio-political forum to lose any desire to be on SDN.
5. Get off SDN