Yes, I know the game has received a lot of negative criticism for its length and I even completed it under 45 minutes. But there is so much replay ability and the AI has to be some of the most advance I've seen in quite a while... (We're looking at you Metro Last Light.... >_>)
If you a hardcore Metal Gear Solid fan, it is definitely worth it because you can spend hours trying to stealth a mission without being caught with reflex mode off. The controls were very responsive and well mapped out as well.
I don't know about you guys but this has me really excited for the Phantom Pain! If you want linear, scripted gameplay, STAY AWAY!!! It was clearly meant to be played multiple times over!