I know I am really, really late with this, but I was thinking a bit about vanilla and faction balance, when I realized something: Dwarves are the most aggressive overly-obsessed dicks in the world.
Let's take a look at their actions in the barrens. Despite there being a peace agreement between the horde and the alliance, the dwarves move into Barrens and blow up a random tauren village, massacring most of the stonespire clan and destroying their holy sites. And for what? Because the dwarves wanted to do an archeology survey.
And its not just the barrens either. When the discovered only the slightest hint of some titan artifacts, the dwarves actually invaded Mulgore itself, blowing a hole into a mountain and attacking any Tauren who would approach the digsite.
Tales of dwarven atrocities are not just limited to Kalimdor either. The biggest atrocity committed by the dwarves is probably their attack on alterac valley, the current homelands of the frostwolf tribe. Despite the dwarves having no claim to the valley, Ironforge has decreed a "sovereign imperialistic imperative" to take the valley for ores and titan relics. Despite the stormpike guard arriving with explicit intent to slaughter every single member of the frostwolf tribe, they are now claiming that they were merely peaceful explorers and that the orcs are merely mindless savages who attacked the dwarves because of their warlike nature.
And it isn't just the horde that has suffered at the hands of the savage ironforge dwarves, but also their fellow allies. When the dwarves helped rebuild stormwind, supposedly for altruistic reasons, they claimed a portion of the city for themselves, dubbed 'the dwarven district', establishing a supply line between the district and ironforge, no doubt waiting for the opportunity to declare a "sovereign imperialistic imperative". But the biggest horror caused by the dwarves was probably when they opened up the ancients vaults of Uldaman, releasing a horde of troggs that would eventually invade Gnomeregan, killing most of the gnomish race.
And, it's not really changed since Vanilla either. Dwarves are notably racist against tauren, blood elves, high elves, orcs, goblins and trolls. General Twinbraids slaughters a civilian mining operation in the barrens solely because they happen to have the same race as the saboteur who blew up Bael Modan. In addition, Moira's backstory strongly implies that the dwarves are heavily sexist as well, a fact which is backed up by almost all notable dwarves being male (even when compared to the other sausage-fest nations).
In conclusions: Dwarves are EVIL. They attack nations who they have a peace agreement with, are racists, sexists and warmongers, use the suffering of their allies for their own advancement and their recklessness has resulted in the deaths of most of the gnomish race. EVIIIIIIIL!