Sincerely in most reviews of this game the short length of the game is easily described, and of course they are correct, however it seems like no one is actually caring for the point of the Metal Gear series, obviously well known for story, but for this game it is the perfection of stealth. I would indeed like to see a playthrough of the main storyline in one go, the first time, actually obtaining a perfect stealth mission where they were never seen and discovered every hidden item that leads to further details to Chico's and Paz's stories of which is obviously needed to be important for the next part of the story, this is clearly impossible and has given myself at least 10 playthroughs of the main mission so far and I still haven't gotten every item (I'm not the best at finding stuff btw, but it is still part of the core games story), and the game is a 30$ price tag to fund the further development of the next game in the series, of which looks to be the single greatest debut of Metal Gear yet to myself, and any amount of commission to help make that game longer, bigger, and much better. The gameplay itself is extremely advanced, the AI seems to be dum in the game, with the usuall "What was that sound" and "Who goes there" antics, however they are deceptively cunning as they perceive threats extremely well when alerted, that's why its so hard to get that "S" rank you want near the end as the enemy immediately closes in on you and you have to use your own skills to escape being seen or found, of which really gives me the heart beating action when some soldiers doesn't notice you in the bush because they missed walking on your leg by a hair and u have your rifle pointed ready to fire, that is what has made this game for myself, the shear repetition and replay value for the struggle of obtaining perfection.
I hope my review has changed some minds about this game.
One mission,extra side missions, lots of replay value when you want to get a good grade. Just a taste for things to come. Don't get caught up in all of it's too short talk, if you want to you can get a lot out of ground zeroes.