Ross from Steam Train (/Game Grumps) has some of the best ones.

Gah, I went to find my favourite, but it's vanished.

Basically, the entire review is the guy complaining that Spiral Knights just 'appeared' in his Steam library. He played 0 hours. If that isn't promotion, I don't know what is.

I liked this one I saw the other day for Doctor Who: The Eternity Clock: "WHAT DO WE WANT? A GOOD DOCTOR WHO GAME WITH TIME TRAVEL AND OPEN WORLD EXPLORATION! WHEN DO WE WANT IT? THAT'S IRRELEVANT!"

"Recommended
Fable 3 Comes With An Exclusive Wait2Play Feature Just For WindowsLive Users!
You'll Be Waiting For Weeks at a Time To Play This Watered Down Game!"

I love his irony ,p

Just stumbled upon this The Dig review: "Written by Steven Spielburg, the game is meant to be the sequel to Indiana Jones and the Legend of Dan Akroids Crystal Skull. Unfortunately, due to copyright reasons, they had to set it in space instead. 10/10".

The best review for Deus Ex: Human Revolution

The review you saw reminds me of this video.

Here is a review I really like:
"What? A brain in his stomach? Everything is fine. Trust me, i'm a Doctor."

This one...

Made me chuckle. xD

http://steamcommunity.com/id/psychomantis/recommended/4560/

Not an user review but whatever.
Look at TotalBiscuit's review here. :p

Post more XD

This was a review for Source Filmmaker by one of my friends:
"this game fucking sucks where are all the headshots"

I felt that I needed to share this hilarious review, it's from Big Rigs: Over the Road Racing:

"After playing Just Dance 2 for the Kinect, I didn't think that video games could get any better. That was until I picked myself up a copy of Big Rigs. If Nicholas Cage and Justin Bieber made a disabled baby, that had the looks of Sarah Jessica Parker and the personality of Lindsay Lohan, it's name would be Big Rigs. This game did more than just keep me entertained. It touched me in a way that only my creepy uncle has touched me before. I've decided to devote my life to Big Rigs and am starting a my own fan club for the game. Let's talk about the gameplay first. The wide expansion of maps to choose from (five) kept me wanting to race again and again so that I could master them all. The AI to compete against was unbelievable, and were so tricky and smart that it almost appeared as if they never left the starting line. I got so good at the game, that I was able to hit 2 Billion miles per hour after morphing through a mountain!!! The graphics are also astonishing. You feel like your actually driving in real life thanks to the beautiful textures on the buildings, mountains, and other landscape that the game allows you to drive straight through!!! Pick up this game right now if you want to be blown away by a work of art thousands of years ahead of it's time."

You can read more here: reviews.

You don't have to wear pants in this game.

11/10

Starbound.

My own review and I think it's funny :P
Why so Serious Sam: The Second Encounter

A modern classic!

Not sure if posted already: Woodcutter Simulator 2013

I thought mine about Beat Hazard was. Then someone said it was useless and decided to make it a bit serious (keeping the joke) so someone may buy the game after reading it. If you don't like the positive feedback or the review, at least give a chance to the game. It's worth it.

Bad Rats

This

Read dayz reviews

On DayZ :"I drank bleach and died. 12/10"

http://steamcommunity.com/profiles/76561198050309086/recommended/

I created this one about Game Dev Tycoon.

There was one for "Guise of the Wolf" that had been marked as abusive by the devs. The review just said "nope."