You are right , we had 628 reviews with 0 rating and 1559 reviews with 0.5 rating .. they are all now 1This is my latest 0 star review before and now it's a 1.0. My average course rating before the upgrade was 2.40 and now it is 2.46. I believe I had ten 0.0 and eighteen 0.5 ratings before and now I have none - they all went up to 1.0 stars which is why my average went up so drastically.
I will fix that later today/tomorrow