I love watching video reviews of games, as well as videos on system retrospectives, hidden gems, and genre collections.  A very popular YouTube contributor goes by the name of Metal Jesus, and his channel, metajesusrocks, is one of the best out there.  He reviews multiple systems, has frequent guests appear discussing all aspects of gaming, and does a great job presenting hidden gems as well as detailing his various gaming discoveries and additions over time.  Check his channel out and watch his game room grow every month, while learning about various games and systems past and present.  I can say with sincerity that since watching his channel, my game collection spanning older systems has grown exponentially on his wonderful recommendations.