Finally just checked out the trailer. I guess you guys got my expectations really low, because I didn't think it looked all that bad. I would obviously refrain from final judgement on the quality of the CGI until it actually gets released to theaters.
As far as the storyline not being from the novel, that was kinda what I was expecting anyways. It's been quite a while since I read the book, but I don't remember there being a main character with an arc to follow. I don't remember much of the details from the novel though- I thought it was a bit plodding.