Carrie Henn is one of the main commentators for the Aliens audio commentary version, and she admits to hating that line aswell. She said "Thats all the other kids would say to me in the playground after that, I was so embarassed" - bahaha
The director's cut of the 3rd is a vastly different movie - there was alot of flak between the studio and David Fincher regarding the theatrical release. Fincher's cut is about 40 minutes longer and includes entire plotlines that are cut out of the theatrical. The ox instead of the dog is one (and even though the dog scene is pretty horrible, the alien bursting out of a dead ox hanging in the middle of an abbatoir is pretty cool too), Ripley is found first washed up on a beach and then the craft is found, and the prisoners manage to trap the alien in their storage facility, before the crazy guy kills the guards and lets it out. I think it makes a much better movie.