The Meta Description tag is still a very important part of the optimization process but not in assigning a rank value. Not only does your description get spidered by the search engine robots, it’s generally your last opportunity to seize the searchers attention and get them to visit your site. A weak or poorly written Description can cripple your chances of getting the traffic you’re trying to get.
Your Meta Description is the text (summary) that is displayed in the search results, just below your page Title. Because the Title is often not enough to get a visitor to click on your site listing, the Meta Description should compliment the Title and offer sufficient incentive for the visitor to click on your site.