Some of the decision depends on your school and major. A 3.5 in engineering at MIT is not the same as a 3.5 in Biology from Boston University.
I had marginal grades (3.4x/3.5x) from a known soul crushing grade deflator without +/- grades, mostly average ECs and a great MCAT. I got in to several schools, including the top 20. I had some interesting things in my experience and I emphasized them.
I'm also handsome and charming and I had a nice tan for the interview. That didn't hurt either.
Yeah, MIT has a 5.0 scale, rather than a 4.0 scale.
The rank myth:
Seriously speaking, MIT has some of the
best professors in the world who are EASIER to learn from. In fact, many of MIT's classes are online
complete with midterms, finals, and lectures right here:
http://www.fatwallet.com/forums/free-stuff/1247592/ Take a class for yourself and compare. If you are in the Boston area, note that MIT's libraries are all open to the public. Here's a list of MIT's libraries with their hours and maps:
http://libraries.mit.edu/hours/ I think you will agree that these are
wonderful study facilities. Many lower ranked schools cannot even compare to the
quality of instruction and quality of study areas/libraries offered by MIT. And MIT's
tests are NO MORE DIFFICULT as you can see for yourself.
Personally, I was surprised when I took my first classes at an ivy league that they seemed
easier than the non-ivy league classes I took. It was because of the quality of instruction and academic support. And I learned more.
Another myth I would like to knock out:
Some colleges collect data on the grade-spread for all of the different majors they offer. Engineering is NOT always the lowest on that list.
A final point:
Lastly, some ADCOMs have told me that they are open to hearing about individual circumstances where a student follows his or her passion and chooses a major based on passion and interest, despite NOT having previous training or skill in that area (comparable to his or her classmates). Example, a poor disadvantaged student majoring in music with no previous music lessons and without the ability to read music joins a freshman class full of students who've had life long lessons.