I'm playing through Metal Gear Solid 4 for the first time, and act 5 is a nightmare. Maybe it's because I used up all of my healing items on previous chapters, so I have none left and no way to get any beyond randomly stumbling across them, but the first section is a pain due to infinitely respawning FROG soldiers and Gekkos (especially when the Gekkos LITERALLY kill you in one hit), and now I'm stuck on the second section, where I'm forced into a prolonged firefight with FROG soldiers who can take off half of my health with a single machine gun burst and attack me from every angle.
I generally try to play pacifist runs in Metal Gear Solid games, though in this case, I have no idea how that's supposed to be possible. My only options seem to be a pistol, a shotgun, and a sniper rifle if I want to take people out non-lethally, and all of those are too slow to reliably hit the FROGs. (unless they're at close range, but at that point, they've drained most of my health)
I honestly have no idea what I'm supposed to do here; it's basically trial and error, and a huge difficulty spike from the rest of the game up to this point. (though act 4 was pretty rough as well, with several forced Gekko fights) I'm not looking forward to the boss fights with Screaming Mantis or Ocelot.
EDIT: Just beat Screaming Mantis, which was easier than I thought it would be. Now I should just have to go through the microwave hallway and fight Ocelot.
EDIT 2: beat the game!