I wish I knew the answer to this but I don't. MGS5 is the first MGS game I've ever played and I love it. I love stealthy games and this game is the best stealth game I ever played. I love how the A.I guards are so realistic in their approach. If they think they see you, they'll go to your current position and keep looking and be on high alert. I love that. Anyways, if you played every MGS game to date, is MGS5 the best one in terms of gameplay and realistic A.I ?