It shouldn't be surprising that people might like MGSV but hate Peace Walker. PW's shittiness has been detailed pretty well in this thread (trivial stealth, terrible combat, legit horrific boss design, awful story, etc), and what structural cues MGSV takes from Peace Walker, MGSV simply executes much, much better.
For example, in Peace Walker, you can do as much Mother Base stuff as you like, but you won't unlock anything interesting until you've finished the main story. Peace Walker treats the story missions as something to get out of the way so you can start the real game of endlessly grinding the same old levels and bosses over and over. You still find E-rank dudes right up until the final levels; the only way to get higher ranks is to grind certain side ops that you have to follow a ridiculous order of other side ops to even unlock, or capture all the dudes that pour out of those clown car APC and tank fights (which, as we've previously discussed, are some of the worst gameplay scenarios you could ever hope to find yourself in).
MGSV steadily increases the ranks of soldiers out in the world, to keep you constantly interested in Fultoning and developing. It makes really awesome stuff available to develop all throughout the game, so you're always getting some cool new toy or some really useful new upgrade. Mother Base itself isn't as interesting a place to be as I'd hoped, but the fact that it's a physical place you can build and customise and visit made me far more engaged in building my army than Peace Walker's overhead screenshot.
Peace Walker made you play the same tiny levels over and over and over, because that was all the content it had. With enemies that spawned in the same places every single time, you ended up just moving through levels at a jog, taking the occasional potshot at the dude you knew was going to be around that corner. MGSV has stuff for days, and even when you do revisit the same areas they're generally open enough, with clever enough AI that you can complete the same objective any number of different ways.
tl;dr, MGSV takes everything that was good about Peace Walker and improves upon it, and omits everything that was bad. #PeaceWalkerSucks
So, OP, just Fulton more dudes, assign them to your Intel team, grind that fucking Pupa fight until you have enough bullshit to make Zeke or whatever, find The Door Knob six times and then enjoy your shitty bossfight that you'll wish you'd just watched on Youtube.
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