Arbok: Have you looked at Eldar and Tyranid tropps? They look EXACTLY like Zerg and Protoss. The Tyranids are controlled by the hivemind, they have
Zerglings,
Hydralisks and much more. Their head shapes are much closer to that of the Zergs than the Aliens' (the headplate goes down to the brows, the face is more articulated than an Alien's). The Eldar use warpgates (same architectural style even) and all that fun stuff and also have that elongated cranium shape the Protoss have, never mind their troops actually have attacks like the Psi Tempest. Also, Warcraft was created after they didn't get permission from Games Workshop to make a Warhammer game. Of course they didn't directly rip off Warhammer because that would be illegal so they created a clone with enough difference to be legally clean and enough similarity to stay recognizable.
Never mind the Terran Marines in Starcraft look nothing like the colonial marines in AVP, they're much closer to the
Space Marines. Note the large shoulderpads and how the armor goes behind the head, including the large backpack. Different helmet but overall similar style. UT2003 ripped the Space Marines off for their Juggernauts, as did tons of other games.
Wikipedia says the Tyranids were inspired by the Aliens but the Zerg implement changes Games Workshop added, like the long claws and more articulated faces, plus the hivemind. AFAIK the Aliens don't operate as a large, coordinated group, they are only bound to the queen.