.hack//Sign is not boring or confusing. If you have seen Evangelion, which is created by some of the same people, you can see how the "confusion" is actually an important story device called Mystery.
As the other comments eluded to, this series is one in a multi-format anime/manga/game series. Hack sign is only the second part in the series. So the claim that the ending resolves nothing, first realize that this series was never intended to "stand alone", but to complement the other parts. Second, please refer to the other animes done by these people: Evangelion and Ghost in the Shell, both have inconclusive endings, like it or not. If you can't stand a complex plot; you prefer simple, predictable plots; then this show is not for you.
As to the boring part. The show may be slow moving, especially the episode where Mimiru waits for Tsukasa in Dun Lorielag, but if you are paying attention fully, you notice how well written the show is. It is portraying the sometimes tediousness of online gaming, but more importantly, showing how Tsukasa is living on a completely different timeframe from other players. This serves to give the viewers some insight into how Tsukasa must be feeling, and how the other "normal" players must be exerting themselves trying to befriend him. .Hack//Sign is a beautiful story. With well drawn characters and backgrounds, and well written music. The characters and dialogue are complex, as well as the story. I recommend everybody buy/watch this anime, as well as .hack//liminality and also play the games. They are all fun and each are a part in a larger puzzle. This whole series has quite an original concept. It certainly is not boring or confusing.
