Can we talk about this game?
Disclaimer: I'm pretty new to the MGS series. The only other one I've played to completion is MGS 1. I faintly remembering watching one of my brothers play Snake Eater. Other than that, I'm a fresh in the water to the franchise.
This beast has the best gameplay of any stealth action game, no any third person shooter I've ever played.
The Fulton system is fucking amazing, and every thing you can collect in the game has a purpose in the HUGE interconnecting systems the game has. All those mooks you would normally just gun down in other shooters can directly improve your motherbase, which in turn gives you more resources/ability to develop better weapons and armour.
Oh, flowers? Who cares, right? Not like you'll ever actually use them. Wrong. They're used for non-lethal weapons and certain medicinal drugs (like the phantom cigar and such). Gun emplacements and turrets can be used to defend your FOB. Vehicles can eventually be fultoned out and used on the battlefield, even tanks and armored vehicles. Remember those fucking Skulls that gave you so much trouble? You can eventually get a replica suit and can develop pills by fultioning the skulls that GIVE you their same abilities (creating mist, OP power armour, and stealth camo).
It's such a simple system (or at least it seems that way), that just gives way to so many awesome gameplay elements.
Admittedly, I like, and most other people find chapter 2 to be lacking in story, which only a handful of missions that actually matter. The rest are just rehases of past ones, which the gameplay is good enough that I don't mind too much, and they provide a more challenging experience. I just wish they were additional content on top of a satisfying conclusion to the game.