I hear this a lot, and I'm not so sure. Don't get me wrong, I thought Bio was taught very well. But I think if all you care about is the MCAT, I'd take it at the easiest place possible and focus on MCAT Bio review independently. In terms of content overlap, the level of depth for the MCAT is a lot shallower than what the Bio course goes into. And the MCAT also requires experimental analysis that Bio courses don't really cover. On the other hand, bio courses go over plant and evolutionary stuff that is very uncommon in MCAT coverage.
All that is to say, I'm glad I took it because of the letter of recommendation (from the prof, which helped the committee letter), and it's a good class. But a lot of people struggled in that class so if you're looking for an easy A, I'd take it elsewhere and do self MCAT bio prep.