It's just not a great theatre. I love going to the movies, but these theatres are small (in terms of number of screens), old, and uninspiring. I'm a snob when it comes to movies. I'm happy to pay $12-16 a ticket for a great experience. Harkins Fashion Square 7 just doesn't get it done for me. It's shocking really, being in Fashion Square, a beacon of class and high end shopping, to have a pretty lame theatre in the middle of the food court.
A plus side is that the theatres are huge, so even for a big event (opening day of Avengers), there is ample seating.
I'd come back with a big group if that was the only option, but I don't anticipate being back too soon.