Pretentious, sure. Crap, no.
You own whining basically pronounces the fact that you didn't understand the purpose of the series, which was to invoke discussion and thought. The "plot", such as it was, was left intentionally vague so that each individual was free to make their own interpretations. If you actually read the transcript, you would know this (they actually state that they left it intentionally vague). The point was to make you question your perspective of reality. You take away from it what you chose to. If you got nothing from it, then it's only your own fault. It's not meant to be a story: it's a conversation piece. :)
And with regards to people who feel that posts about this series are off topic because of it being anime, they are incorrect. Much of the imagery used is easier for people in the technology sector to relate to than anyone else. We tend to have a VERY different perspective on life, the universe, and everything than most people do. For example, I'm sure that you've experienced a situation where you're out with a group of friends, and start letting loose with techie talk with one of your friends, while the rest of them look at you like you've got 7 heads and a bag of marbles hanging from one of your noses. That's the same view you seem to be taking of Lain. Get the picture? :)
-Packgrog
Coffee is mother, Coffee is father