Absolutely not. And also, a person who gets 40+ definitely doesn't have to be a better doctor than someone who gets a 30. My pre-med club at Pitt brings in a lot of adcoms, med students, and physicians from UPMC to talk to us about the application process, med school, etc, and every single time they talk about the time they interviewed some guy who got a 45 and had a 4.0, tons of research, clinical experience, publications, etc and didn't get in. There are apparently many of these, as I've heard this story at least 5 times. Each time, the guy got rejected because he was rude, condescending, and basically had zero compassion or communication skills.
To make a long story short, MCAT isn't everything. GPA isn't everything. You're selling a whole package. Whether you get a 40 or a 30, you still have to back it up with EC's and a stellar interview.
The MCAT is half luck anyway. It all depends on what you're strong in and what is thrown at you on test day.