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Images leak of Valve's next game, and it's an Overwatch-style hero shooter
(www.eurogamer.net)
Though the way the leaker describes it makes it sound more like a 3rd person MOBA than a hero shooter.
Revolution is flat out better then most AAA retail games, both in quality and length.
Portal Stories: Mel is also something to try out. There's some small references to Mel in Revolution, but playing Mel before Revolution isn't necessary, but recommended.