Very strange. I would expect it to be one of the worst of the Dungeons brand considering that it is not standalone. However, going into an attraction with the mindset of looking for every blackwall possible, rather than where the show lights want you to focus, to slate the attraction is not the mindset of a regular guest rather one just looking to find every negative in an attraction they don't want to like from the outset. All reviews I have seen from day guests have been quite positive so far.
The attraction itself is not needless, it adds to the Alton Towers RESORT portfolio, of things for hotel guests to do whilst enjoying their short break, also have you considered that extra ticketing revenue could be used to develop future projects?