The professor I took for A&P 1 had negative reviews online, but the main reason was because of her thick Indian accent - she ended up being my favorite professor that semester; she was truly amazing!
If the negative reviews are lots of "OMG DO NOT TAKE THIS PROFESSOR" and give a valid reason as to why, then I'd wait it out and register with a better professor next semester - you've got to remember that you're paying money for this, so make sure you spend it wisely.
If the reviews aren't quite so harsh but sound like they were written by folks that are lashing out after getting a poor grade, then take 'em with a grain of salt.
Is there any way you could chat with advising? Sometimes colleges have wait lists for their classes, or even wait for a purge at the beginning of the semester and see if you can get in then - don't give up hope