It's really bad. 9/10.
Eleven and Wide-face visit a spooky haunted house. There's tons of spooking here, it's frankly too spooky. They harass and TRIGGER a veteran while he's trying to ghost-hunt, then the Doctor just basically solves the mystery that's driven this man's life in the course of about 15 minutes of actual work. Clara gets a whole different kind of spook when she realizes the Doctor walks in eternity and that to him, she's already a ghost. BRAVO CROSS.
Psychic Verity informs Clara that the doctor has some spotty instances of black ice inside him that may result in delays of up to a half hour on certain routes. The two of them also confirm that whisky is the 11th most disgusting thing in the world, just above heterosexual relationships and just below white males. She also informs the Doctor that Clara is just your regular, average, run of the mill normal girl.
In the end, it turns out that all the monster really wanted was a mate. The Doctor lets him keep and breed Clara over and over until she's spent, and ends the episode by going and picking up another Clara echo from a similar time period. He also finds the future descendant of the guest characters and brings her back to cockblock her ancestors for the rest of their lives. Shhhhh: It's totally the plot of Listen.