Indeed. I Used D&D hobgoblins from Minifigs as my Uruks,these are before Citadel came on the scene,oh yes and Ral Partha when I could get them. I guess the timeline for Orcs for me ran like this:
Minifigs
Ral Partha
Asgard
Citadel
Bear in mind I'm in Australia, and tis all happened over a coyple of years by which stage I'd discovered Glorantha...