Bought as part of MGS5: The Definitive Experience. Yes, the first mission is short, but wow... the atmosphere and game mechanics are so immersive it's phenomenal. Replayability is high, as several new side missions unlock once the first mission is completed. Awesome fun -- even the ludicrously long (with tons of slo-mo) cutscenes. Kojima, you madman -- I'll go wherever you lead.