There is the bulk metadata download. That should be faster but it relies on the title and author being close to what is needed.
I'd say you will need to do several passes. You could use like the Quality Check plugin to help work out which books need the most work. Plus some search and replace to clean up some titles. Then it is a matter of getting the metadata. It might help to disable all except Goodreads as a source when doing this. That will speed the fetch up and not confuse things when the different sources suggest different books. But, it could mean the matching is inaccurate.
I would also suggest adding some tags, either in the tags column or a custom column, to indicate the state of the books. That way as you clean them up you can tag them as such and easily exclude them from further work. Or use multiple libraries. Put all the bad ones in one library and move them to another as you clean them up.
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