I think they call it "!rtd" for a reason, and it's not because it stands for "roll the dice"... It's short for something else. People that use !rtd are usually the ones who can't play worth shit without it, and I speak from experience (and not just in Tremulous- TF2 has some equally-awful !rtd servers too). And X is pure cancer, I imagine it's the reason why people think battle-grangering is a valid tactic. If you're human, feed until you can afford a painsaw, if you're alien, grangerspam until you can afford an advanced marauder. Either way, you're all set and you win X, congratulations.
/nerdrage