I have seen this Anime recently, and so far it is enjoyable but with some flaws, which I will get to later.
The good: The plot is great, but doesn't live up to its successor .Hack//SIGN(which I couldn't get over its plot, probably one of the best animes I have ever seen). The animation is also done in a different way, but its a good way.
The bad: I watched this in English, and I thought the voice over was really bad in some segments of the first episodes. It was somewhat forced, and it was mostly the voice over of Tabby. Her voice just ruined the anime for me. Later on, she doesn't talk overly excited or high pitched and talks normal, which should have been like this throughout the whole series. Another bad this is the script. What I mean by this is the dialogue. Sometimes, the dialogue was just too cheesy and caused those awkward moments (especially with Haseo and Shino). This may just be because of the English version, but it really took away from this great show. One last complaint is how slow it starts off..It takes about 15 episodes to get interesting, then will finally pick up. After that, it isn't too bad.
This is anime is alright, but not nearly as good as SIGN. 6/10