1. A computer-implemented method for assigning ratings to media assets, said method comprising: obtaining at least one user-rating of one or more user-rated media assets in the media asset collection; calculating a first rating for an unrated media asset collection based on the at least one user-rating of two or more user-rated media assets in the media asset collection, wherein the rating for the unrated media asset collection is calculated by taking an average user-rating of the two or more user-rated media assets in the unrated media asset collection; assigning the first rating to the unrated media asset collection; determining whether there is one or more unrated media assets in the media asset collection; assigning a second rating to the one or more unrated media assets in the media asset collection, wherein the second rating that is assigned to each of the one or more unrated media assets in the media asset collection is equal to the first rating of the unrated media asset collection; determining whether the at least one user-rating of the one or more user-rated media assets in the media asset collection has changed; recalculating the first rating for the previously unrated media asset collection based on the at least one user-rating of the one or more user-rated media assets in the media asset collection that has changed; and assigning the recalculated rating to the unrated media asset collection.