The Orcs are once the major antagonistic force in the Warcraft universe. They were savage beasts much like their mythical counterparts - however, as time progressed, the Orcs slowly began to reclaim their original status as a shamanistic society ruled by honor rather than bloodlust and would slowly but surely become a more benign factor.
By the time World of Warcraft came into being, the Orcs had become (by in large) a structured society and although still feared warriors were not the savage killers they once were under demonic corruption, sadly in the aftermath of the Cataclysm many Orcs have began to regress back to a more savage lifestyle under the guidance of Garrosh Hellscream, yet even with these troubling developments most Orcs in Warcraft are far removed from the monsters they were in the original series.
The same can not be said for some Orc races outwith what has become known as the Horde, however, such as the Blackrock Clan - who are piratical raiders and a scourge of humanity or the demonic Fel Orcs that plague the Outlands.