Originally Posted by
Thage
Garrosh's massive blunders in Borean Tundra aside, as Overlord of the Warsong Offensive he was responsible for picking the commanders in Howling Fjord, Grizzly Hills, and Icecrown. Krenna lost control of the situation in Grizzly Hills so badly her own sister killed her in a mak'gora to prevent the Horde there from rioting.
Either you're being dense on purpose or reading comprehension isn't your strong suit. This began because I noted his interpersonal skills were a problem that damaged his allies' trust in him. His lack of people skills caused him to fail to properly deescalate things with Cairne and to trust Magatha Grimtotem, known schemer who was already widely suspected of poisoning her mate to secure his position for herself, as his shaman in the mak'gora. His lack of people skills led to multiple clashes with Baine, who was providing Orgrimmar with badly-needed water after the goblins destroyed Orgrimmar's water supplies both in Durotar and Azshara. His lack of people skills incited Vol'jin enough for Vol'jin to make a death threat and leave Orgrimmar (only to later regret that he let Garrosh get under his skin so badly). The only situation where his lack of interpersonal understanding worked in his favor was with Sylvanas, who he still failed to properly oversee and thus was allowed to do things that even he called an abomination, in part because his appointed overseer, Cromush, was weak and ineffectual.
Also, if you think anyone rational is going to put an oath above the well-being of their people, you don't understand people.
Honestly, if Thrall were more proactive (remember how in my first post I noted Thrall picking Durotar was a bad idea born of significant misunderstandings of what the orcs wanted/needed) he would have worked with the Horde's druids and shamans, and possibly the night elves (if he had the sack to rein in the Warsong and establish proper diplomatic channels) to get an actual ecosystem going on in Durotar that could support farmable land and a sustainable water supply. However, Durotar's problems were exacerbated by the goblins being allowed by Garrosh to pollute Orgrimmar's water sources, which necessitated shipments from Mulgore and raiding Ashenvale.
Even then, the game is intentionally mum on how much actual progress in Ashenvale was kept. A lot of the new 1-60 experience shows Horde blitzing Alliance territory only to get pushed back in the counterattack. And again, most of the resources the Horde obtained were immediately used up perpetuating the war that began to secure more resources, keeping the Horde in a downward spiral for most of the Cataclysm resource wars and the Pandaren Campaign.
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In fairness, Arthas wasn't necessarily evil until he suffered multiple mental breaks during the Scourging of Lordaeron, going mad with desperation and helpless fury (and the Culling marked his fall from grace, but there were several moments where he was on the cusp of redemption only to fall again).
His big issue was that ultimately, he was a coward who ran from his problems when they became too much to handle. And he couldn't run from the Scourging, which caused him to crack instead.