well i agree with you to a certain extent in that somebody who can pull off an impressive gpa at a more competitive university, especially with a double major, is going to draw attention from adcoms. i'm not sure if i go for your "lower mcat because I didn't have enough time to study" bit though--most people taking the mcat have classes to sort through and there's always the option of taking the mcat in august. though I don't think it's completely indicative of your intelligence and ability, it is a hard test and not just anybody can do well on it. just because somebody majored in something non-sciencey and "easy" like basket-weaving (I really wish that was a major) doesn't mean that they're not capable, and doing well on the mcat would show that they are. my opinion is that going to a good university helps you more if you have a less than stellar gpa, and going to a less competitive university won't hurt, especially if you can prove yourself on the mcat. here's a little break-down of what I think:
reputable university, high mcat, high gpa -- very good (you shouldn't be worried)
reputable university, high mcat, lower gpa -- hmm -- good (maybe the school's really hard) -- interview?
reputable university, lower mcat, high gpa -- interesting (did something happen?) -- interview?
reputable university, lower mcat, lower gpa -- not impressive
not-so-reputable university, high mcat, high gpa -- very good at most places
not-so-reputable university, high mcat, low gpa -- hmm what happened? not so impressive, but a possible interview
not-so-reputable university, low mcat, high gpa -- not impressive, doesn't say much about your school
not-so-reputable university, low mcat, low gpa -- sorry dude, that really stinks
anyway, that's just my little opinion on the subject--let me remind you that I know nothing about nothing so don't go extinguish your dreams if you fall under the low mcat and low gpa at middle-of-nowhere university. also, i'm sure extracurriculars/recommendations/personal statements throw that little break-down i did way off.
anyway, to make this more on the topic of this thread, i agree with the above posters when they said you need to make sure you're really interested in both your majors if you decide to double major because it'll be a lot of time and you want to make sure you'll do well in both of them. plus you won't really have time to take extra non-related courses, which can be interesting. ok bye!