It probably should be more of an 8 rather than 9 but seeing this many nagging reviews...
This piece has HUGE potential. In those few episodes it manages to show the universe (like scanning codes to open portals, using phones to keep track of their progress, those areas being locked by hidden fences) a plethora or characters (that don't look or act alike), great art (with plenty of detail and without those dumb underwear shots), good music (though unfortunately rarely played), a few twists (like that fingershot at the end) and jokes, everything being mixed in overall dark (or just far from fairytale) mood.
Plot overall wasn't the best but... how can all this be squeezed in 60 minutes and reasonably development? Obviously it was rushed but characters are not irritably stupid, act naturally, dialogues and situations are well above good and I wish it would not have ended so abruptly, though they just had in order to have certain closure (unlike many others) and that just ears them more respect points.
Hell, I would even read the manga I guess, which is extremely rare for me.