I give my reviews compared to my expectations of the films going in. This is a low-budget film, nobody was expecting a Scorsese masterpiece. To rate the myriad B-movies on Tubi on the same scale as movies with much better budget, staff, talent, equipment, connections, and time would be absurd.
Killer Rack was quite funny. You'd think, based on the title and premise, that the movie would be quite exploitive; but it's not. There's one brief scene in a hottub where actual breasts are seen for a few seconds. The title characters are clearly prosthetic, and don't appear much. If not for the blood and gore, this might get a PG-13 rating.
Jessica Zwolak played Betty Downer quite well, and Debbie Rochon as Dr Cate Thulu was absolutely hysterical. The lesser characters gave the same low performance quality as one expects from nearly every actor in the genre, which is part of the appeal.
The songs were funny too. While the director, writer, and musicians are male, you can tell there was significant female influence in the process.
A movie about a boobjob may sound like it'd be aimed at a male audience, but women will possibly find this more amusing.
If you're bored on a Saturday afternoon, have 90 minutes to spare, and enjoy low-quality movies, I'd definitely say it's worth watching.