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