(First off, each season of Gunslinger Girl is only 13 episodes long. I don't know why it says 9001 here...)
This show, including its first season, had the opportunity to do many things really well.
It could have been a heartbreaking/warming story of the humanity of its "cyborg" characters and their relationships with their handlers.
It could have been about the humanity shared on both sides by terrorists, assassins, and government agents.
It could have been simply a badass show about assassinations and bodyguarding.
Best of all, it had the potential to do all of the above blended into something spectacular.
Unfortunately, it falls short of achieving anything remarkable by not quite ever developing its characters or story due to how much it tries to do in such a short episode count.
The one thing I really appreciate about Gunslinger Girl is that it never fails to make you feel a little sick to your stomach whenever you see one of the girls holding a firearm.