honestly, i only think the best schools, and not even all of them, pay attention to things other than gpa and mcat. harvard definately does, but most places seem to accept nearly straight by the numbers, based on previous matriculants. Of course, they look to see you have SOME ec's but i doubt they really use them to distinguish between applicants significantly. Basically, if you meet a GPA and MCAT cut off, you will get the interview, and depending on the place, your EC's may or may not be a factor that gets you in. All interviewees are not equal, better stats, schools, and gpa's help you out. Until i see asian kids talking about going to penn with a 32 and a 3.7, i stick to my story.
What i don't get is why schools sometimes interview someone with lower or typical numbers for the school, and then after the kid has a great interview, the kid just gets rejection/ waitlist. why even bother?
being well rounded doesn't help, in my opinion, at top schools, as nearly everyone is well rounded. it does not take much to say you've volunteered, played some sport, did something medical, and something cultural. its being exceptional at a particular thing that is rare, not being "pretty good" at lots of things that everyone else can do too.