Yes!! I love reread books. I do not do it as much as I used to when I was a teen and had zero life. I will reread once or twice a year. I also will give second chances once and twice a year for novels I was not too crazy about.
I will absolutely change ratings if I feel like my opinion changed. Especially with second chance novels. If I still hated it...I won't share it again or update my rating....but if I did like it more (even a hair more) I will share it and update the rating higher. Usually my rereads are for books I LOVED, so the rating usually never changes. There are rare times when I just didn't like it AS much so I may drop it a hair. That is a rarity though.