Dark and intelligent Sci-fi anime are by far my favourite anime, or really any show at all, live action or not.
Im trying to put a list together of "all" of them so I can know which I havent seen and check them out.
I'll Kick off the list, but hopefully you gall can fill in the gaps:
Akira
Cowboy Bebop
Serial Experiments Lain
Evangelion
Psycho Pass
Steins; Gate
Ergo Proxy
Darker than Black
Tokyo Ghoul
Deadman Wonderland
Elfen Lied
Ghost in the Shell (original Movie... I havent seen any others)
Full Metal Alchemist (sort of the PG version of Dark but still...)
Black Bullet
EDIT 1:
[quote]
Parasyte
Death Note
Attack on Titan
Dollhouse (live action)
Neon Genesis Evangelion
Texhnolyze
Mobile Suit Zeta Gundam
Bokurano
Blue Gender
.hack//Sign
RahXephon
Guyver: The Bioboosted Armor
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EDIT 2: [quote]
Madoka Magica
Haibane Renmei (starts off pretty happy, but its totally different by the end)
Another
Higurashi
Future Diary/Mirai Nikki
Monster
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Future diary/ Mirai Nikki is probably my favorite anime. Good action, suspense, romance, and it's always testing your trust with everyone in the anime (especially yuno). The concept was cliche, but what it lacked in originality was made up for in execution.