WC3: Night elves! They're this ancient, ten thousand year old race and friends to the ancient powers of nature! Blessed children of a powerful goddess.
Wow nelfs: tauren, trolls, mogu, pandaren, mantid, nerubian, qiraji, Jinyu, saurok, - all over ten thousand years old easily. Mountain giants and such don't actually give a care about the night elves, oh, and not only is your goddess not even a goddess, this other race knows her better than you. Oh, and your racial leader, malfurion? He thinks you taking issue with the orcs cutting down your forest and forsaken assasinating druids in their sleep is petty. And all your gods agree.
WC31-3: Humans! Seven powerful kingdoms spread across the world, with differing political affiliations and histories.
Humans!: Only stormwind matters, gilneas is empty / most of its people in darnassus and such, Dalaran's neutral, Kul'tiras isn't even ingame. Stormwind has no culture or specialty of its own.
WC3: Orcs: Race of noble savages corrupted but working to overcome their past.
Wow: Garrosh lol (Oh, and Thrall partnered up with the forsaken, killed a dwarf expedition in 1k needles, and left the warsong in Ashenvale)
WC1-3 Trolls: Ancient race looking to get back in power / lone tribe looking to get back in power
WoW: Lol pretty soon the Darkspear will be the only trolls left, the Revantusk won't ever do anything important, and all the other tribes are dying off, even Zandalar.
WC3 Tauren: Strong nomads that like peace
WoW: So pacifistic they'll ignore the quillboar murdering their people and give them water.
WC3 Goblins: I laugh in the face of danger!
WoW goblins: Your leader planned to sell you and thrall put him back in power. He's nowhere ingame.
Dwarves WC3: Ancient titan made race looking into their heritage
Wow dwarves: Council of three hammers doesn't matter, Brann "Which wire will destroy the world and which saves it?" Bronzebeard is the most prevalent character.
Worgen: Not in wc3 but in Vanilla wow they were this otherworldly feral race, and in Cata's opening they were people struggling with their curse... only then their story dropped off forever.
Draenei WC3: Master assasins of a race nearly wiped out by the Orcs
Draenei Wow: Really eredar, never do much of anything except wait for the legion expac, morally perfect and nigh immortal, know the light better than humans and -apparently- know Elune better than the people that've worshipped her for 10k years. I don't see why anyone would like this absurdness, why bother being any other race when the Draenei do it better? (Huge arcane tradition too!)
WC3 Forsaken: What joy is there in this curse?
Wow Forsaken: Being undead is suddenly GREAT for no reason.