You can beat them all with the gatling gun completely un-upgraded. D-Walker is literally a skull deterrent.
This word has been overused to a laughable degree across Peace Walker and now Phantom Pain.
this shit will seriously go down as one of my most hated changes of pace in a game i've ever played. what a god damn nose dive, even if it ends up being just this mission
16 had alternatives. I figured those were intentional ie the game giving you the chance to play like you wanted
this crap is just inexcusable. it's not hard; it's a dread
There's also apparently an AA gun nearby that you can use. I found the mission frustrating as well but really it was not that much different to me than some past MGS bosses (Rex in MGS1 in particular.....with the terrible check pointing) where the game turns into a full on action game. It stands out here more because of the way it had been flexible up until then.