I'd like to know how I can delete all podcasts (via command line) or something, because unsubscribing from 90+ podcasts takes too long.
How to delete all Podcasts at once in iTunes
deletingitunespodcasts
Related Solutions
I have been having this problem and while I don't use the rating quite the way you do, I get annoyed when new episodes are automatically assigned a rating.
I found this solution tonight for iTunes 12.5.1. I selected the podcast which was getting auto assigned (2 stars in my case). It's a very frequently updated podcast as episodes are short. I set View->View As->List. In the upper right corner there is a circle with three dots across the middle. Click on that and the rating option appears. I set the default back to no rating and all the hollow star auto ratings went away, even for episodes I was finished listening to.
On iOS5, just right-swipe over a podcast episode to show the delete button. This isn't available on earlier versions.
Best Answer
In iTunes, go to the Podcasts library (View > Media Kind > Podcasts) and view as Classic List (View > View As > Classic List).
Your list of podcasts should then appear in the main window. Select All (Edit > Select All). Click on the 'Unsubscribe' button in the bottom right corner.
This doesn't delete the files, it unsubscribes you so that you stop getting updates and new files. You can keep files even after you unsubscribe. To delete all the files, select all the podcasts you want to obliterate and type 'delete'.
NB If some of the podcasts are no longer subscribed to, the button will be 'Subscribe'. If you deselect those podcasts (Command-click on any selected podcast to deselect it) then the button should change to 'Unsubscribe'. If you start at the top and use the down arrow key, you can go through the list and see which podcasts this would apply to.