Better than I expected.
I have been to a number of Harkins theatres around the Valley, and because this one is at Metro Center (and everyone warned me about going near that mall) I anticipated going to a 9:40pm horror-flick here could be a nightmare (pun absolutely intended).
Older, sure. A little dank inside, sure. Fixtures and decor dated, sure. But the crowd was average, service was decent, and we had a fine time.
The ticket-taker actually gave us a little reassurance on the film we chose, so that was pleasant.
Only suggestion I could give, turn down the AC temp a bit when the theater gets full (and when it's a suspenseful film). A lot of hearts pumping and lungs breathing in a small theater, like whoa!