Rebirth

Dark Souls 2 ! Preordered on Amazon, got delivered 2 days earlier than expected, plus they lowered the price because at some point the game was a bit cheaper. Also the Steelbook of the Black Armour Edition is gorgeous.

Playing right after release was worth it, there's this feeling when you feel you're discovering the world at the same time as other players.

The Binding of Isaac: Rebirth!

No game ever came close to this one in "Pre-order" trust!

Other one that have my full trust like Isaac, is SPAZ 2. I'll thrown my money to them as soon as they allow me... ;)

Nothing

Kingdoms of Amalur

Portal 2, just had to have it on release day and replayed it for 3-4 times so far

I don't preorder as such, but the only Kickstarter game I finished (and enjoyed) was Broken Sword 5. That's not to say that it's the best Kickstarter game I backed, just that I didn't play the others yet (largely thanks to BS5 being available on Android).

REBIRTH! REBIRTH!

Hard to say... I must choose two of them.

PS3: Yakuza 4

PC: The Binding of Isaac: Rebirth (PS Plus free title for PS4/PS Vita, yay for Sony for that)

Also I pre-ordered Torment: Tides of Numenera but we'll have to wait to see if it's as great as I hope it'll be.

Little Big Planet 2.

Assasin creed III Collector's Edition and Witcher 3 Collector's Edition sure will be fine :)

PAYDAY 2

Let's see:

• Metal Gear Rising: Revengeance. It was a great PC port, and a hell of a lot of fun
• Dark Souls (PC Version). Sure the PC port was, let's say lacking, but the game was still so damn good on it's own it was worth looking past it's issues
• Dark Souls 2 (PC Version). Like Dark Souls 1, but with a much better port and worse level design.
• Deadly Premonition (PC Version). God awful port, was in a bundle within a month or two after release, and it still is one of my favorite pre-orders.
• Shovel Knight. Not much to say, it's an incredible game.
• Half-Life. I'm an OG PC Gamer motha fucka.

Brutal Legend. The game turned out to be overrated by critics (that didn't help sales, though), but I've sold tf2 promo items for a little more than game's price.

Baldur's Gate Enhanced Edition
I didn't get that much though. It crashed at launch and I had to wait a year for a working patch. Nevertheless, the game is incredible. But I should had waited
until it was released first. I preordered to support the developers.

Assassin's Creed IV: Black Flag

I am not sure I can say which one was the best (since I usually preorder games I think I will like anyway) but taking into account how much I played them and if I played them as soon as they were available, I have to say WoW expansions over the years. Had to level up fast :P

Bioshock Infinite. It came with thre Season Pass for Pre-Ordering. But I don't like to pre-order games in general.

Drakensang River of Time personal Edition...funny fact, I ordered it exactly 5 years ago

Call of Duty: Ghosts

Bishock infinity

Witcher 3.
Still havent gotten the release yet, but I cant see myself being unhappy with the game.

BioShock Infinite, Dreamfall: Chapters

Dark Souls 2 on Steam.