If you cannot identify what the author is trying to do, your opinion about the work is of no importance at all.
But the only way you can identify what an author was trying to is by accurately and precisely describing what he in fact did do. The only evidence regarding his intentions is the work itself. Of course, I'm only a reviewer, not a critic, and review is simply an exercise in reading comprehension. The commentary in a review has value only insofar as the reading has been accurate.