Margot Lois' seeming lack of professionalism is mostly due to the tone of the movies, I figured. As has been mentioned on this thread, when the movie's tone is a bit more humorous or quirky, lack of realism kind of gets lost in the fun. Like, when she's trying to prove that Clark was Superman, and it gets all slapsticky, I'm fine with that. I do sort of think some of the other weird high jinks go too far, though, and makes some of those Lois scenes age pretty badly.
And Injustice's premise is just awful. I can't imagine too many Super fans being happy with seeing Superman turn evil because his wife died, or Lois getting the fridge. But this is what happens when the story's not written with care for the characters in mind.