Interesting premise, chagrin-inducing execution, but the fujoshi and Kuroneko episodes rescued it in my esteem (the later episodes in Kirino's main arc dragged).
Overall, fun and cute, but not as incisive an analysis of otakudom as, say, _Genshiken_ or _Otaku no Video_; and I'm a little troubled by this apparent trend of casting beautiful girls as otaku which has been continued in _Boku wa Tomodachi_ - this is misleading wish fulfillment, such people basically don't exist (http://www.reddit.com/r/anime/comments/1cqtae/in_honor_of_kuronekos_birthday_my_favorite_scene/c9ja9a5), and the real reason seems to just to be sheer fan-service (not just sexual) and not story or plot or meaning.