Still sounds like denigration if you ask me. On the sliding scale of human vs. monstrous, I'd say the Warcraft version of orcs falls pretty far into the human end of the scale.
Well, that's a terrible example on multiple levels. The eredar were approached by a god-like being that they had no cause to question, and the majority of them were force-converted into demonhood on the spot once Kil'jaeden and Archimonde took the deal Sargeras offered them, which originally had nothing to do with becoming demons. I wouldn't even say the eredar were corrupted at all in terms of choosing to join Sargeras; he essentially extended them an offer of power and enlightenment, and then enslaved them all the very instant they said "okay." The orcs, by contrast, were more gradually seduced into changing their nature over time, ceding more and more authority to Ner'zhul (and thus to Kil'jaeden), gradually abandoning their traditions over time, until finally Gul'dan saw fit to cement their "loyalty" by having them drink the blood of Mannoroth. This isn't the same process or story at all, and the orcs, by their own admission, had a lot more buy-in to their corruption than the eredar ever had.
Also, we're not assaying the relative worth of the social changes the Legion inflicted on the orcs, because it's immaterial to the original statement at hand. It *is* a corruption of their old ways, and Thrall's intent was to attempt to restore the orcs to their old traditions such as embracing Shamanism, and through that re-embracing the orcs' original love and duty to the world at large. So the question remains: why keep the corrupted and befouled ideal of the Horde itself? Why not reorganize the orcs back into the clan structure they once had, albeit with a stronger core? This is the question you've thus far failed to recognize, much less answer.
Any government that's approached near-collapse multiple times in a handful of years, not to mention been drawn into bloody and all-encompassing world wars in the process, is definitely what I'd label a failing government. If you can't see the failure there, then there's not much I can do to assist you aside from continuing to point to the obvious and hope you eventually open your eyes. Also the very fact that after the second of these massive wars that led to unthinkable loss of life, the orcs *finally* recognized that maybe a single point of absolute power was a bad idea and did what Thrall should've done during his initial reforms, and abolished the seat of the Warchief in favor of a system that allowed for the rudiments of oversight and power balance.
Thrall penned Rise of the Horde in-universe as part of his memoirs, so the entirety of its contents, including Kargath joining the Shadow Council, would be information Thrall was privy to. Thrall likely learned all of this information over time from Orgrim, as it was Orgrim who essentially dismantled the Shadow Council and killed most of its members, information he gained by torturing Gul'dan. So yeah, plenty of reason to either not name shit after one of Gul'dan's inner circle, or to rename shit after you discover said person is now a demon leading a pack of demonic orcs. You shouldn't glorify sadistic and bloodthirsty madmen just because you think their name is cool.