Today, Matt Cutts released a video, advising not to duplicate Meta descriptions on your website. Matt said that you should avoid duplicate same Meta descriptions across your website pages, instead you should create 100% unique Meta descriptions.
Matt suggested having No Meta descriptions OR to have 100% unique meta descriptions rather than have duplicate descriptions. Meta descriptions have been important part of Google Search algorithm in past, we have seen that in past Google eliminated the importance of “Keyword” Meta tag as well.
Matt said that even his own blog does not have any Meta descriptions, he leaves this work to Google algorithm to create appropriate snippets. If you website do not have Meta descriptions, Google’s search technology created and display itself based on your page contents.
So next time, if you do not have time to create unique Meta descriptions, better is to leave them and let Google do his work while you create quality contents for your website.