*Gmail has introduced a completely new Compose box (http://gmailblog.blogspot.in/2012/10/introducing-new-compose-in-gmail.html). So now, the criticism related to accessing the address book while composing an email (2nd paragraph in Criticisms) is no longer valid. 
 *'Mark as Important' feature is not mentioned in the Filters and Labels section.  
 *Integration with Google Drive and Google+ are not mentioned. 
 *Now, Gmail users can have their own 'custom themes', i.e. images uploaded from the computer can be used a background image. http://gmailblog.blogspot.in/2011/04/custom-background-image-themes.html  -