A lot of programs list specific minimum reqs to meet ED "competitiveness." State schools seem to have a cut-off of at least a 3.6 sGPA and ~87th - 92nd %ile MCAT. My school required a 3.6 cGPA and at least a 32 MCAT (back in 2011) to be considered. If you didn't get selected, your app was sent into the regular admissions pool and then compared to everyone who applied.
It's tricky because, if I remember correctly, you could only apply to either A.) One school when you selected ED or B.) only could choose one school on ED while being allowed to apply to any other school on regular admissions. If the former, then you better have an amazing app or else you'll be sending in secondaries in late October through late November.