If there's no spawn and no builder/armory, the game should automatically end in 5 minutes or so. Otherwise - try Transit and 2 marauders (we had no granger in that game). Basically marauders can stalemate forever, especially if humans only have access to s1 weaponry.
Did you notice almost all griefers so far are humans ? Two reasons:
- humans are highly dependant on base, and can't spread it around map. Therefore human base is always in one place. An easy target.
- s1 aliens totally suck against turrets. If you don't know what I mean: griefers tend to remove all buildings except reactor, and build lots of turrets instead. With so many build points and cluttered base design focused exclusively on stalemating/killing dragoons, griefers can fend off even occasional dragoons. You can't disable a server so well as an alien, except for transit/marauders.