Avenger, 13 episodes of staring at something and trying to look deep. wow.
The plot advancement can be summarized in one episode, and the background is trying so hard to look cool that you end up thinking "was it really worth to keep us waiting for 13 episodes just so we can hear this anti-climatic shit?"
.hack sign had a few unanswered plot lines, i hated it, Avenger has two plot lines, one is in the same level of "and the prince killed the dragon" and the other one is never reffered to other than being a plot device to get to the first plot line.
really, it had some parts, but i won't go as far as recomnding it to anyone, there are much better animes around, you shouldn't waste your time on this, even ikkitousen was better.
NOIR>HACK SIGN>>>>>> AVENGER