I went in BML last week - end of the day and it was just me and the people I was with. Have done is 4-5 times now having gone with people who hadn’t experienced it before. I guess it’s ok but my main gripe like others is that (a bit like DBGT) you only really need to do it once plus it is taking up a decent sized space which has previously house fright night mazes.
On a side note I love the music played in that area and also the uniforms that the staff/actors wear - I want one of the jackets 👌