My favorite movies are usually because I like both of the two stars, plus the story. If I only like one of the stars it probably won't make my favorites list. And if I really don't like a particular star, after I've given them a few chances, (sometimes they get a bad pairing or an off movie,) I probably won't watch a new movie of theirs at all as I know what to expect.
I may give the movie a chance if MANY here recommend the movie. I would never have watched
We Need a Little Christmas as I don't like Erica Durance and don't know the male lead. But, so many liked Lynn Whitfield, who was an older supporting character in the movie. I watched and I loved Lynn Whitfield. Lynn brought her Emmy Award winning talent to her portrayal of her character and she what made the movie.