Yeah, sometimes simpler is better. Honestly, the plot for Legends Collide was way too complicated and the house worked not because of that story but in spite of it.
These are the Paris Monsters at their lowest moments, they are on a killing spree, you've got to escape. It isn't canon and you don't (and shouldn't) have to think about it too hard. Given some of the really interesting design regarding SIF, water effects, air blasts, the beautiful sets, and at least on my run very solid scares, I agree that the story criticism feels nitpicky and I'd much rather talk about anything else regarding this house.
This isn't a VS house, and it shouldn't be. Any VS house with more than two monsters is going to get muddled, let alone 5. How quick we forget because of how hard the UCM:LC casts went by the end, but this time last year we were all complaining about the lack of Dracula in that house. The fact that they fit 4 to 5 monsters cleanly into this house is pretty impressive.