This is hard to rate. It would be totally justifiable to give it a 4, or 5, or 7, or 8. The problem is that I wouldn't really recommend it to people who aren't (yet) fans of the show but I quite liked it. It's just a little footloose and fancy free.
We have a present day setting that goes back and forth between a virtual speed dating service and an IRL meetup, both from the perspective of Vicky. And before the evening begins, we learn that there is a serial killer called the Lonely Hearts Killer on the loose. From the brief scenes we get with Vicky and a mysterious man who has come to her flat, She seems to have met somebody who checked all the boxes, but it becomes increasingly difficult to believe she found the man of her dreams as she spends one 5 minute session after the next encountering a completely different kind of crazy. There's a cocaine fueled gigolo, a man more interested in finding a replacement for his mother, and a woman who claims to have been mistaken for a man by the agency. Each scene is very sharp, the writing is top notch, and there's so much wit and flavor to the dialogue that it really is a fun ride.
There is a big problem, however. Spoilers aside, this basic premise has been in every anthology show ever produced. The whole concept for the episode is unoriginal. And, less importantly, both Pemberton and Shearsmith do a pretty mediocre job as actors here. Vicky, on the other hand, is fantastic, and carries this segment to the very end. An average story told exceptionally well and a fine - but not outstanding - addition to the 8th series.