I play Metal Gear games for the gameplay. In all honesty, I have no fucking clue what's going on in the story nowadays. It is one of the most convoluted franchise plots in video game history, and you need to be directly on top of that shit to keep it all sorted. I skipped a game or two after Metal Gear Solid and now I'm not sure I have any hope of unraveling it.
So even though I may not have the full picture as to why I'm running Snake around doing the things he's doing, they are usually pretty fun to do anyway. And MGS5 looks like no exception. The latest trailer from TGS shows about 20 minutes of (highly scripted) gameplay, and shows off everything from stealth, to humor, to outright combat, to fast-forwarding time with Snake's magic e-cigar/blunt.
At one point Quiet even appears to snipe a grenade out of the air and into a nearby helicopter. So there's that. Oh and we even got a release window. "Sometime in the year 2015."
Cool, I'll mark that on my calendar.