I can not see Auto Rename button, and there are quiet a few feed back with the same issue
I am usually very fast to reply to such issues. Which threads do you refer to? The Auto Rename button appears in the Rename column, are you sure it’s not hidden? Are you using the Media Library in the List Mode?
The information is very unclear.
If the information is unclear, let me know how I can make it better. I try to explain how it works on the website, and I believe most users are using the plugin without any troubles, otherwise, I would enhance it right away.
Also, giving a bad review is not really the way to deal with an issue you are having with the plugin or asking questions. I am always here to help.