Ground Zeroes is a bit odd to talk about and review in isolation, since it's pretty much tethered to the main game's story and its too short in itself to actually go out of your way to dissect all its mechanics, it really just serves as a technical demo showcasing the newest and final era of Metal Gear running on the all-new Fox Engine. It doesn't try to be more than that, and honestly if I was excited for The Phantom Pain back in the day getting a fully-featured demo with pretty much the exact gameplay as the main game and a shocking and thrilling couple of cinematic cutscenes of that caliber following the events of the Peace Walker Incident, with those dreadful and honestly pretty dark moments, damn, I would be sold with getting TPP the day it released no matter what.

The only real complaint is that they actually charge you a pretty penny for it, and while yeah you can get some mileage out of it considering that there's multiple missions to do and whatnot, it's way better to get it nowadays bundled in with the main game for dirt cheap.