I recently went back and played a few of the side missions in Ground Zeroes. I found that I had almost overlooked many of the features. You can play things in such different ways, run and gun, stealth, steal a car-load-it-with-sleeping-guards-drive-it-off-a-cliff. Its really good. I can see that a lot of people took issue with the final cutscenes, and I'll be honest that I don't know the characters well enough as I never finished Peace Walker, but I didn't have as much of a problem, it was more a sudden shift in tone that was jarring.