I've decided to give the rating system a revamp.
Instead of the % ratings there will be six categories, these are:
ESSENTIAL - A book or movie that must be experienced.
HIGHLY RECOMMENDED - Very good but lacking that special something to make it essential.
GOOD - Something that's pretty decent but has faults.
DODGY - A story that isn't up to scratch but may appeal to some people.
POOR - Nothing much to recommend for anything that falls into this category.
ABANDONED - This is for anything so bad that I can't endure the entire thing.
I don't intend to change any previous ratings but might if I have the time or the inclination so in general this system will start with the next review.
Hopefully this makes the ratings a bit clearer, let me know what you think.