As someone who has previously been to university and experienced halls of varying quality prior to my stay at Weston, I must say that the reviews are disproportionately harsh.
The accomodation has security (cameras and actual security on the premises), 24-hour residents who are actual staff (not 2nd or 3rd year students like many unis get to do the job on the cheap instead), working facilities (lifts, appliances, Internet (although there is no wifi)), halls are always clean and orderly (trash is taken out daily from the communal bins in the flats (no trash lying in corridors, again like many other accomodations)), en-suites, decent location (although you will spend much time walking around to get to shops, there are two bus stands adjacent to the building for the 147 which is free for students), vending machines inside the building, spacious social areas for each flat, large kitchens, etc. I don't know anybody at UoM who isn't envious of my accommodation and theirs are rated higher.
All reviews are the views of StudentCrowd members, not of StudentCrowd Limited