I'm glad to see that GiTS has inspired such a discussion and so many comments. Its a masterpiece of story telling, futurism and the challenges facing society, not just robotics/AI but also demographics (Solid State Society).
Have you watched all of it? I want to get into it but am not sure where to start. If you had to choose 1-2 seasons of TV and a few films, which ones would you watch?
For the purest GiTS experience I would just watch the first three films GiTS (1995), Innocence, and Stand Alone Complex.
GiTS 2.0, in an attempt at improving the graphics, ruined the original feel. I watched the TV series - not bad, but not the masterpieces of story telling that the 3 films are.
But who cares what I think - what them all, and form your own conclusions :)
I still get goose bumps every time I watch this https://www.youtube.com/watch?v=AsIQ_kA77b4