This will be a short review. The main point I'd like to make is that this .hack movie has an intriguing package but in the end is unsatisfactory.
Story: I won't spoil anything but I want to say that the story is intriguing in the beginning, while the actual cause of the problems in The World this time to me is disappointing.
Art: Good, even if I'm not a big fan of this type of CG in movie animations, landscapes and characters (real and in The World) are well done.
Sound: Fair, nothing special, just OK.
Character: Good, personalities are well characterized and I've empathized with the protagonists.
Enjoyment: Fair, the plot is engaging, the rhythm is well paced and the fights exciting, except for the "last mission" maybe.
Overall: I think it's a fair movie, you can watch it if bored on a rainy night but the .hack series has better anime.