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This really is dependent on the type of person you and why you play Metal Gear games. If you play the game mainly for the story (which I would have to assume a lot of people do) there was really a severe lack of content. But even then I have done the side ops and they only added, at best, 4-5 hours. This is, again, something that if dependent on the the type of person who are, I generally do not give a **** about rankings so whenever I got a mission complete I was done with that mission. But yeah, different people will get different amount of content out of the game. For me that 30/40 minutes was kind the main course and the extra side ops stuff was neat, but not really something I thoroughly enjoyed.
