Hope the new book doesn't contain as much nonsense as Empire did
Your good points above would seem to support something on the lines of:
Hope the new book doesn't contain as many debatable 'facts' as Empire did about the TSR2 for example
rather than a very general comment against a book that has been well received by many.
Anyhow a novel is fiction and surely by definition fiction cannot contain rubbish - only stuff that one might think unlikely in real life.
May I ask at which stage in its unusually varied life were you associated with WH904?