I haven't seen any issues with the metadata download and updating the books. I normally do this from the metadata editor, but, have used the bulk metadata download (the "Download metadata and covers" option) a bit recently. Any time metadata has been found, it is displayed, and if I accept it, the metadata is updated.
Probably the first thing to check is the metadata download configuration. This is in the preferences. Make sure that you have fields selected under "Metadata fields to download" that is in the top right of the configuration. And the same can be configured in the enabled metadata sources. These set which source supplies which field, and the main configuration sets which fields are updated at all.
Other than that, we need some examples. And the logs. Hopefully that will give a hint as to what is going wrong.
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