It's not a PvP game, there's marines. (Now imagine 3000 years from now trying to unravel this joke without a bunch of cultural knowledge haha)

You pretty much get balance whine in any competitive game. Sometimes the communities mature out of it, but the scrub mentality comes very natural to a lot of people.

I think it's a funny joke, though. Even though, when I've played Stacraft, I've been the one making marines.