Actually Mr.Polite.Service.User could have seen Megan a 100 times and still not be able to argue the rating on that basis. Unless he was in the room with the reviewer and the WG he can't know what happened on that particular booking.
I'm not sure what reviews MPSU has been reading, as the recent reviews haven't really been mind blowing for Angel Lodge. Even a few of the recent positives haven't sold me on the place, far too many of the WGs seem to only do OW for example.