Pretty much the only race who's population sizes made any sense and were in line with WC3 are the Night Elves in the pre-release novellas (and nowhere else), the dwarves given their total lack of losses and absorption of their co-clans and the Forsaken who can raise more from the humongous bodycount. The powerhouses being a city founded by one small harbor's worth of orcs and a city that got razed by only a portion of the Horde back in the day who's collective population being in a basement is ludicrous, and they're actually the more convincing ones, given that they at least have the fig leaf of other humans/orcs joining up. The Darkspear, tauren, blood elves (and high elves even more so) as well as the draenei all have a massively outsized footprint for what should be their logical amount.
@Syegfryed
While Thrall did use elemental powers no issue from the start in the Wrath Mak'gora and I don't think he was cheating in Nagrand, he did make two major faux pases. THe first is that he only used his powers after Garrosh had kicked his ass in a straight fight and second that he claimed the elementals were his own power and called on them to solve his problem in what's a man on man contest.after previously chewing him out for shit like dark shamanism.