I have beaten Metal Gear, Metal Gear 2: Solid Snake, Metal Gear Solid, Metal Gear: Ghost Babel, Metal Gear Solid 2: Sons of Liberty, Metal Gear Solid 3: Snake Eater, Metal Gear Solid: Portable Ops, Metal Gear Solid 4: Guns of The Patriots, Metal Gear Solid: Peace Walker, and Metal Gear Solid V: Ground Zeroes.
Pretty much the only new Metal Gear game I've played is Ground Zeroes, and I have yet to play the dank memer games with Invisible or It Has To Be This Way in them. Essentially, I like the old games too much to play the new ones even though I would probably like them. It's to the point where I think I've spent more time playing Metal Gear Acid than Phantom Pain, even though Phantom Pain has 40 trillion awards. Somebody convince me to play the new ones please I feel uncultured