Google head of search spam Matt Cutts, released a new video explained the concept of more pages on a specific site doesn’t mean to have a better rankings.

Matt Cutts said “I wouldn’t assume that just because you have a large number of indexed pages that you automatically get a high-ranking. That’s not the case.”

He explained that if there are more pages, chances are more to rank for different keywords  and more likely to have more overall links and PageRank , which do directly impact your rankings. But the number of pages on specific site, does not have direct impact on ranking factor.