In all honesty, if the reviews are awful and you're banking on doing well enough on the back of this degree to get into graduate entry medicine, it's unlikely that you will do well enough there to get onto GEM.
You'd be better off thinking of an alternative career and study that, or study pharmacology at a university that gets better reviews, or one that also offers graduate entry medicine so you have a foot in the door there already (should you actually do really well in your degree)