i wouldnt mind if its one badass pred that just goes balls out, with total disregard for his own survival to get the job done (ie...into the hive...ALONE!). also i dont mind if its a small group of preds, as long as they all do some killing.
as for the single predalien taking out a whole ship of preds, thats pure nonsense. If there is a crashed spaceship, it better be from misplaced plasma or some otherwise dissabled controls/power system.