Well, I would have liked them to be more truthful to the Hikikomori lifestyle. I guess it's more of a challenge to have your protagonist interface with the world around him via 2ch than in more conventional drama-setting. The Anime didn't make a SINGLE reference to 2ch, did the manga? what's with that?? I mean, he's a hiki right? What's with this guy going outside as early as episode one?
To that extent I think the writer copped out a bit on the subject of hikis.