Here's the most important thing you need to know about Serial Experiments Lain: give the series 5 episodes before you drop it, otherwise you would have missed a truly unique anime experience.
I get scared very easily, and some parts of this anime freaked me out. If you're the kinda person that likes mildly creepy sequences and that weird stuff, replace that 5 for enjoyment and give it a 10. That's just from my perspective. I didn't enjoy watching the anime, but my was it cool.
Serial Experiments Lain delves into the question of reality, existence, time, and memory. The anime starts out crippling slow and
is rather hard to follow. Though this would usually bore the viewer, here it intensifies the abnormal events that literally drown the series. Every episode will leave you hanging with questions, and the questions will get better and better. Let's get this straight here: Serial Experiments Lain is weird. Hence the name if its first episode. Certain plot elements and sequences are scary, unorthodox, and sometimes downright bizzare. Watch this anime with your thinking caps on, as there's tons to be learned from here.
The characters in Serial Experiments Lain are different from your usual anime characters. You basically have to watch for yourself to find out. Lain's character development is very pleasing and one of the features of this anime.
The sound is limited to the OP, ED, and ambient sound effects. Well done, but this anime isn't worth watching for the sound effects. OP is good and siuts the anime well.
The art consists of hard lines, but has a very dull feel. Several key scenes are repeatedly emphasized and visual motifs such as shadows literally jump out at you.
In conclusion, Serial Experiments Lain is an intriguing anime that everyone should at least try. The series ends well and leaves the viewer with many thoughts and questions in his/her head.