I think that the answer is clearly no. Why are you strongly discouraged from taking all (or even one) of your prerequisites at a community college? It seems kind of naive to assume that once you jump up to a non-community college each one suddenly is equal. My guess would be that an adcom wouldn't deduct from your GPA but might add to it slightly depending on where you went for undergrad. I'd think that a 4.0 or a 3.9, even from a "lower ranked college" is still damn impressive. Plus, if you beat people from "higher-ranked" schools on the MCAT, how will they explain that? It's a standardized test.
My school's pre-med committee keeps data on how its undergrads do who gain admission to medical school. Over the past decade or so, the accepted GPA for a student from our school has been 0.1 lower than the national average GPA for accepted applicants. I'm at a top-15 undergrad. Does this mean that med schools consider our curriculum to be tougher? I'd say not necessarily. Most people here I know play "the admissions game" very well, and are heavily involved from the beginning in various health-related clubs, volunteer organizations, etc. That could easily make up for a 0.1 difference in GPA (especially if the GPA is approximately 3.5 or higher).
In my opinion, the effect is negligible. If you are a state school and you really think it's easier, get a 4.0 and ADCOMs will respect that obviously. If you are at a really tough school and you are asking this so that you can slack off in one of your classes, well, you shouldn't be doing that anyway. Nothing's a golden ticket, so take the chance if you want but realize that it's ill-advised. I DO believe that it's harder to get good grades here than it would be at a lower ranked school (based on my conversation with friends who are pre-med at my state school). But, I look at that as an advantage. I'd rather get used to the idea that you have to work hard for good grades, because eventually it will catch up to you (when it really matters, like your 3rd year rotation evals or residency applications).
Sometimes I wonder if getting into a more competitive undergrad might help me more in the medical school admissions game. In the end though, it just comes down to working hard and getting the best grades wherever you are. Life's not fair, but eventually it starts to become more performance-based rather than grades-based. People aren't going to say, "Yeah, well he can't tie suture, but he went to Harvard, so we'll honor him for his gen surg rotation." I think it's just a matter of doing your absolute best wherever you are and not looking at how other people are doing. Otherwise you'll go crazy trying to figure out whether you are ahead/behind, and all that speculation is just going to distract you from doing your own thing. You could complain just as much about med schools and URM status (which is probably a greater effect than where you went for college), but most people don't because it's one of those things that nobody knows about for sure and you couldn't change if you wanted to.
