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I ran into this same problem a little while ago.

First off if you have meta no index on them or block with robots.txt then it shouldn't be a big deal if they have duplicate metas or titles, but if you don't and Google simply hasn't indexed them then fixing it could be helpful. For this I have always tried to go by the rule of creating unique metas and titles in all situations. What I did was programatically have the page number auto added to the title at the end and the same with the meta.

Ex.

Title

Blue Widgets Page 2

Meta

Blue widgets are the best, buy them from us. Page 2

While this isnt exactly super helpful to the user it doesnt hurt either, and atleast it will help clear up duplicate meta and duplicate title problems which if you have on the Seomoz reports then you for sure have them in Google WMTs errors as well.

Hope this helps

I am having a large amount of errors in the not found section that are linked to old urls that haven't been used for 4 years. Some of the ulrs being linked to are not even in the structure that we used to use for urls. Never the less Google is saying they are now 404ing and there are hundreds of them. I know the best way to attack this is to 301 them, but I was wondering why all of these errors would be popping up. I cant find anything in the google index searching for the link in "" and in webmaster tools it shows unavailable as where these are being linked to from.

Any help would be awesome!

Thanks yea, that is what I'm talking about. With Google shopping being paid now it just seems like there has to be someone smart with a blog talking about ideas and new things with it. Thanks for the comment.