Eh idk, Peace Walker is what you make of it. If you enjoy stealth you can, if you want to gun everything you can, if you want a good co op game you have one. The bosses are hilarious in co-op btw.
I do agree with your sentiment Oscar, however I didn't purchase MGS4 (I did play and finish it, but there is no monetary guilt here) the only lemon I got was MGS2 with MGS3 making up for that shortly after, Kojima hasnt disappointed me that much yet. (He does massively disappoint me in that he needs to give SnatcherNauts more love, but thats not entirely up to him)