Google Play Books is broken ... if you have tons of books

After knowing Google Play Books supports upload ePubs, I tried it by pushing it to the limit.  So I uploaded 1000 books.  And sure enough, the experience is horrible on my iPad since it probably didn't anticipate me uploading that many books.  And the web browser "My Books" page ain't particularly better neither.  And then I found out that there's no way for me to manage my large collection properly.  There's no search on my library too.  Now I am stuck as I can't even select all my books and delete them.

Google Play Books is now dead to me.