Try the Quality Check plugin. It allows you to simplify some of the work with metadata and also makes it easier to find books that need more work.
You could add a custom column that you can use to flag the state of your books. That way you could flag books that need work or that are in perfect state, and filter the view to show only the books you want to have visible.
Also you can sort on date to get your new books easier to locate.
Usually it is enough to get title and authors right. After that you can let Calibre fetch the rest of the metadata. Check out and activate other sources of metadata, that may help. But be careful, some may add trash. Avoid changes of title and authors. You may have to fix series.
Finally you could consider the source you have. If you don't like the state of the metadata, change source. Try the books here on MR.
Last edited by Adoby; 09-24-2012 at 04:03 AM.