Game with best storyline?

Deus Ex Human Revolution

Max Payne trilogy.

999: Nine Hours, Nine Persons, Nine Doors

I would pick Half Life 1 & 2 ( including DLC's / Episodes )

The story line is just amazing , and I can't wait to play Half Life 3 / Half Life 2 Episode 3 ^_^

The Walking Dead and Metal Gear Solid (particularly 3 and Peace Walker)

Portal 1!

Portal2 & Half Life

Skyrim !

Mafia 1

Bastion and telltale's the walking dead. also thomas was alone

Kotor was really good! But I still remember some of old good adventure games like Indiana Jones and the Fate of Atlantis, Monkey Island or Day of Tentacle. I must also mention Planescape Torment and Final Fantasy series (before 8).

I almost forgot about System Shock!

The first F.E.A.R. and both Darksiders

Final Fantasy VI, VII, VIII and IX, Bioshock 1, Bioshock Infinite, Spec Ops The Line, Bastion, Thomas Was Alone, To the Moon, Mass Effect Series, The Walking Dead, The Day of the Tentacle, Indiana Jones Adventures, Zak McKracken, and so many others^^

Mass effect

pacman

For me Fahrenheit aka Indigo Prophercy has the best storyline for me. I played it five or more times through and everytime there were lots of fun.

Fable TLC.

Ocarina of Time

Tales of Symphonia

Tales of the Abyss

Fortix

Mass Effect series (if you know what it's actually telling you), deus ex and deus ex HR, bioshock.

If everyone hates on the ending, it's a good RPG plotline that makes you think. Most people just skip the thinking part. Mass Effect is a lot more than a literal story guys, that little ending wraps it up wonderfully.

Anyone mentioned Planescape: Torment?

Red Dead Redemption, and Half Life Franchise

Ever 17, specially Coco's Route. Absolutely awesome.