Not sure if you are noticing, but the comment was based off a quote in the manga. The US special forces are identified because one of the corpses is black, because supposedly, "Only the US has blacks in their military"
On other matters though, I think almost every character and every moment in Gate COULD have been redeemable. Even the shit with Rory, and the daddy complex elf.
But the writer is just so goddamn bad. I can describe pretty much every character in Gate with some initial outlines and primary concepts to their characters that are deep and interesting, with all sorts of potential avenues to explore. But every step of the way its written in the most dumbed down, clichéd manner possible, to the extent it feels like the author makes a list of tropes to fill out before he writes an outline to the scene. I keep thinking that its in fact a parody, and the author deliberately was making the worst decisions every step of the way, but there isn't anything for it to be a parody OF!
We have a platoon leader who never desired to excel, but has had to adapt to each situation he was in to survive and do his duty, and thus gets put into positions of greater and greater responsibility he never has bothered to contemplate. We could explore each decision as a potential mistake, or a fluke that he realizes to some horror later saved his team with no possible intelligent decision on his part.
We have an apprentice mage to a master who fucked off half the time, managing her training enough to show obvious merits, but requiring her to take care of him more often than not (Said master fucks off into oblivious two hours in, but whatever). The adaptability to skewed standards though makes her ideal for acting as an interpreter between these massively different cultures, and allows her to be taken seriously by a very interested power, furthering her prestige and competence at a frightening pace.
We have a literally immortal apostle of a god, garbed in her royal vestments which appear almost fetishistic to the newly arriving powers people. A people which are capable of challenging her god through their sphere of influence, even if there is nothing they could do to halt her own advance, or those of any other apostles. A new system of faith and interaction between peoples, a spread of knowledge far more powerful than any church or religion, and she gets to explore it.
I can keep going, each of the characters HAS POTENTIAL, such goddamn potential, but they are all shat on by the author.