I find myself severely dissappointed by .Hack//SIGN. It's cool premise with an awesome music compelled me to watch the series. But by the time it ended, I just said, "good riddens." It was boring, there are too many scenes with nothing going on but talking, and about 25% of the characters are attending the next My Chemicle Romance concert and the remaining 75% are talking about it. The best thing I can say about this is at least it showed me pretty pictures and music which a lot of animes now a days don't do.
I never played the video games so I'm not sure if fans of the .Hack//GAMES would enjoy this. I do reccomend this show if you are into electronica music. If you are younger, I think you might be able to appreciate this show.
This gets a Linkin Park out of a Jisatsu Circle (Google it)