I need an anime to binge on, any help?

Hellsing
Witchblade
Claymore
Trinity Blood
Shiki

If you want dark and bloody watch:
Hellsing
Claymore
Elfen Lied
Genocyber (Warning may cause Trauma)
Ergo Proxy
Akira

Comedy:
Zero no tsukaima
Special A
Plastic Nee-san

Apparently Steins;Gate is pretty critically acclaimed. Haven't watched it myself, but I noticed it on Amazon and am currently considering a blind buy.

• Shinsekai Yori
• Fate/Stay Night Unlimited Blade Works
• Kara no Kyoukai
• Kyoukai no Kanata
• Hellsing Ultimate
• Paranoia Agent
• RAINBOW
• Samurai Champloo
• Serial Experiments Lain

Gundam X, humanity is put on the verge of extinction in the first episode.

Mushishi!

Ghost in the Shell: Stand Alone Complex, Cowboy Bebop, Black Lagoon, Witch Hunter Robin, Blood+/Blood: the Last Vampire, Speed Grapher, Jigoku Shoujo

Kara no Kyoukai

It may seem very strange at the beginning, but it's because of the structure features (movies don't go in chronological order)

Tokyo Ghoul?

The only one I watched was To Love Ru...so...

Parasyte The Maxim also known as kiseijuu sei no kakuritsu! probably one of the best anime that came out last year.. it's still ongoing though our one outs? it's underrated

I would recommend a few based on what you mentioned in the OP, but I'll also throw in some "dark and bloody" titles. Some of them have already been listed, so consider my second mention a "thumbs up."

• Fullmetal Alchemist
• Blood+
• Witchblade
• RiN: Daughters of Mnemosyne (probably the darkest, bloodiest anime I've seen)
• Soul Eater
• Nights of Sidonia
• Cowboy Bebop
• Death Note (not my type of story, but it's supposed to be very good)
• Steins;Gate (on my "to watch" list, also supposed to be very good)
• Kaze No Stigma (just started this one, and it seems more bloody than dark)
• Samurai Champloo (not quite as dark, but bloody)
• Angel Beats (fairly dark, quite bloody, and way too much fun to not watch)
• Sword Art Online (a bloody action adventure rather than "dark," it explores the psychology of online gaming)

**P.S. (Many of these are on Netflix, or have been in the past.)

Trigun wasn't mentioned yet? Trigun.

If you would like a documentary about my schooldays, watch Girls Und Panzer.

parasyte the maxim, enjoy

Just finished Brynhildr into the Darkness, it was decent. The same guy's other story, Elfen Lied is probably even better. Make sure to get uncensored versions if you want to watch either with the gore in tact.

Hunter x Hunter 2011, really good, took me a few weeks to watch though (about 150 eps). Lots of action, I highly recommend it.

Drama: House of Five Leaves, or Honey and Clover.
Comedy: Welcome to NHK.
Action/Comedy: Samurai Champloo. And, of course Trigun.

But, since you're looking for something with a little darker tone, I'd say check out House of Five Leaves first.

Edit: Or, if you want something that's a little cheesy, a little older, but definitely worth a watch and easy to find with an English dub, check out Tekkaman and Ronin Warriors.

A few of my personal faves, Gantz, Deadman Wonderland, DeathNote.

Parasyte: the maxim --> bloody
Akame ga Kill! --> bloody, sometimes dark, sometimes funny
Sword Art Online --> first arc of first season is definetely bloody, first arc of second season is less bloody
Code Geass --> bloody
Death Note --> bloody and dark
Another --> short but definetely bloody and dark

Check out Fist Of The North Star series or The Violence Jack episodes.

I don't know the ones you mentioned but you can try Monster, it's fairly long to "binge on".

Have you tried Ergo Proxy?

Fate Stay Night?

http://www.crunchyroll.com/
14 day free trial

Also I +1 for Death Note, it is awesome if you like dark themed anime.