As the second game in the series that I played (yes, I played this second), I have to say it was incredibly enjoyable. Let me get this out of the way, the cutscenes are long. Very long. But they are worth it. The parts that you play are great and the balance between scenes and gameplay are nice.
I'll make this short since this game is very heavily reviewed. I enjoyed this game. Sure I'm not very good at being stealthy (I had so many alerts), but even a newb at these types of games can be good enough to beat it. I will also say something, to the developers (as if they read this). Please, PLEASE! More Metal Gear vs. Metal Gear battles. That was incredibly fun.