Um, why don't you read the reviews of those who have seen the film already before you decide completely?
I don't trust reviewers, at not least since I read that guy's article in one of our local papers. Basically, to explain, the only films he likes are foreign films with subtitles and everything else he trashes. I feel a kharmic pride that his favorites flop and the one he bags out are million dollar successes.
Secondly, I used to be much more tolerant of diverging from the book/source.
Then I saw a bunch of movies that made me not so tolerant. In order, Fantastic Four, Eragon, X-Men 3, Spiderman 3, Fantastic Four 2, X-Men Wolverine and Transformers 2.
Eragon is the worst offender, Transformers 2 the least offensive.
Anyway, after seeing all these disasters, in which the directors or whoever told whatever story they wanted and who cares about continuity or even plot, I came down hard on anything that was majorly deviating from the established concept.
And my father described the movie to me later, which reinforced my opinion that I should not go to see it.