Also, make "Interested in watching" an option
Not sure if you are already aware of this but just incase you are not:
You can rate TV shows. On the main show page just under the title you will see a box called show rating. You can choose green for good or red for bad. The total number of ratings are shown. For example Stargate Universe currently has 265 good to 4 bad.
I know about that, but it would be cool if there was like a 5 star scale and for it to show on your profile what you rated each show.
Appreciate other sites do use the 5* system.
But as Thor says that is the system WE use.