Notebook Screen Sizes

Hi I am looking at notebooks for college soon and im needing a med-high end desktop replacement. I like to play games and watch movies on my comp and i was wondering if the 15.4’’ screen is still good for watching movies and games. Also all the WGA and all those other weird letters mean nothing to me so just wondering if the 15.4’’ is ok for games and movies.

Many Thanks :smiley: