My (overall) ratings system is very simple (for the most part), and fairly self-explanatory:
Keeper - book to purchase/re-read
One Read - good, but no desire to re-read/purchase
Not For Me - just not my cup of tea
I'm still eeking out my "language" and "heat" ratings, as below; they're still works in progress, so any imput is appreciated!
Every Second Word
Be Prepared to Blush!
*Shameless pilfered from All About Romance's Sensuality Ratings