Two reasons I don't really get the appeal:
1. Are we supposed not to find out that the Mark 13 was a population control droid until the girl just spells it out?
That's a legitimate question, on one hand it's fairly obvious:
a. The movie opens with the Bible quote.
b. The burglekutt guy (i forgot his name in this movie, Avla or something like that) learns that its a called "Mark 13"
c. The television thing talks about population control.
I'm not sure which one of these scenes came last but that's when it becomes pretty obvious, and that's quite early in the movie.
But on the other hand the girl says her line like we're supposed to find out only when she announces it.
2. Ehm, isn't this basically a low-budget Terminator clone once they just get the story and establishing shots out of the way?
(Which I admit were a bit interesting)