I don't know if I would call it my favourite episode of the series but it was right up there. I still think both paintball episodes trumped this...something about this episode bugged me and I'm not sure what.
I enjoyed it well enough, definitely better than the past few episodes, but nowhere near the fun of the paint-ball episodes. And the one with the gigantic fort. Loved that episode.
I think for me, this episode had too much of a... Nerd Pretentiousness? lol, it's tough to explain, but it felt too eager to show its obvious sci-fi trappings and influences while at the same time pretending to be brilliant and unique? I'm definitely reading too much into it. But there was something there preventing me from boosting from "enjoying it" to "loving it".