Yeah, however before Warcraft there was Dune II. But I am not sure which one was more popular at the time and I think Dune II came way before Warcraft.
I think why Dune II is more notable though is that the first Dune game was more of an adventure style came, not a strategy game. Then they changed the game with its successor and introduced the asymmetrical factions that each had a few unique units with differing strategies.
Warcraft took that concept further of course. But even there its rather Warcraft II that really had a big breakthrough.