Overall, I enjoyed the movie. Is it perfect, no far from it. I do think it's much more faithful to the source material then the live action Death Note was, like Death Note it is a very ambitious movie trying to pack a lot of story into a short amount of time. As a result, some characters are omitted and the story is condensed.
To be honest, it felt like I was watching a fan-made movie with a big budget. This is not a bad thing, actually it was refreshing because it makes me believe those who worked on it really cared deeply about the original anime and did their best to show it.
Other reviewer's issues with the show are right, the acting wasn't the best and I would have liked to have seen more comedy. Also elements of the story were passed over or not explained.
What I did like was the homunculus, I thought they were done very well. While the story was condensed, it was still easy to follow and the movie had a good (sometimes too fast) pace.