I want to make reviews of Underrated Games

I like kane and lynch

I'm so sick of you and your fucking rules! Lynch, do this, Lynch do that, Lynch stop murdering the hostages!

Journey of a Roach? Nobody knows it, nobody cares about it, but it's a really good game.

Blazblue! i mean, people should know about it more...

Not sure how "unknown" you'd like them to be, so I'm going to suggest:
Cosmic DJ - I was really expecting this game to blow up a few years ago because it's silly
Hue - finished it a few days ago, can't believe it's not more well known
Solitairica - fun little rougelike game based on solitaire
10,000,000 - I have no idea if this and its sequel are anywhere near popular, but I absolutely loved it
I'd say a few more titles but I think you might feel they're already too well known (for indie games) to be called "underrated"; I hope this helps nevertheless.

Hm, that depends on what your criteria are and where your cut offs are for those. Often enough if these topics arise people suggest the same already well known games with 500 reviews or even more. Far away from being unknown. Well, you can have a look at those (if they fall into your range):

Why am I dead at Sea
Wait - Extended
Our Darker Purpose - Well this one has already over 500 reviews for example -_-
Full Bore
Shu

There are more, but five should be enough. And other people are making suggestions too. And now I have to wonder why my review from Why Am I dead at Sea counts as a key although I have clearly bought it on Steam -_-

Until I Have You - Cyberpunk Platformer. Only 49 reviews on Steam. Great music and atmosphere

Sunless Sea - lovecraftian, dark writing and atmosphere. WARNING: A lot of reading is involved. And I mean A LOT. It's 60% a gamebook and 40% a roguelike.

Cover Card Hunter- not enough people know about that game. It's not underrated in reviews (though it's got more than enough troll reviews on Steam that it's definitely well under what it should be), but definitely in the attention it has gotten.

'course, if you buy into and further spread the "omg thiz game is p2w!!!11" nonsense that the trolling players keep claiming, I will find you. And I will beat you over the head with Liam Neeson. True Story.

:P

That said, at 3,000 steam reviews, it's really only overlooked in terms of being an MMO; there are certainly more niche games available to cover on Steam. Still, it's free, so you can at least try it for your own enjoyment. :)

Assault Android Cactus

WildStar

Maybe not the most underrated but i feel like they are left out by the community despite their great quality.

This is my go-to for underrated Steam games, a Metroidvania platform-adventure:
http://steamcommunity.com/id/thom-22/recommended/332610

Hm... I'm not sure if these are obscure enough for what you want, but I'll list them anyway!

Games on sale on Steam:
Brothers - A Tale of Two Sons
Castle in the Darkness
Chroma Squad
DRAGON: A Game About a Dragon
Her Story
The Cat Lady

Free games on Steam:
A Date in the Park
Mandagon
Sisyphus Reborn
The Average Everyday Adventures of Samantha Browne

This is a really nice and interesting mix of genres in a game. Unknown most, than underrated.

http://steamcommunity.com/id/lordroderickkhyron/recommended/375120/

This is another game with fairly positive reviews, but not very popular

http://store.steampowered.com/app/91100/

How about Demented Pixie? A great fast-paced, kinda-bullet-hell rogue-like that almost no one seems to know about. Has a nice and active developer, too :)

The Sea Will Claim Everything is one of my favorite games - very odd, with lots of strange characters and plenty of reading. A gentle, unusual game, sweet with a political side. It's an insanely-detailed static point and click - there are titles for every book, character notes for every mushroom and flower, and affectionate references everywhere. Positive reviews, in small numbers. The dev is one of the writers of The Talos Principle.

Monsters and Monocles Great Rogue-like top down shooter which follows Nuclear Throne style.
Guns, Gore & Cannoli This one got quite a lot positive reviews already, but I feel like something still missing, it deserves more awareness.

And I might do one for... The Weaponpgraphist.

...which immediately neatly leads to my suggestions for the other two games from the same devs. :)

Remember Me - Very good cyberpunk game which went completely under radar at least for me.
Kingdoms of Amalur: Reckoning - Quite nice rpg fantasy game. Was quite quiet release I think
Risen franchise - I haven't played all three yet, but at least I loved the first game. Fantasy rpg again. Peculiar that I have never heard anyone anywhere even mentioning Risen games.
Styx: Master of Shadows - Another fantasy rpg from which I have never heard anything.
Of Orcs and Men - Just like Styx, never even heard of this one.

Goetia - Awesome point&click, the atmosphere and the story were incredible, despite some hard puzzles.

State of War
Pursuit Force
Pursuit Force Extreme Justice
Dead Head Fred
Infinity Wars
Death Skid Marks
Renegade X
Krush Kill N Destroy Xtreme
Carmaggedon Max Carnage
Chilli Con Carnage
Burnout Legends
Act of Aggression
Sonny
Sonny 2
Colony
Dead Frontier Outbreak
Dead Frontier Outbreak 2
Warfare Online
Block n Load
Crimecraft
Defiance
Streets of Rage Remake
Mega-Lo-Mania
Zero Tolerance
Flashback
Eternal Champions
Lost World: Jurrasic Park
Doom Troopers
Adventures of Batman and Robin
Teenage Mutant Ninja Turtles and the Hyperstone Heist
Alien 3
Robocop 3
Ghostbusters on the Sega Geneis\Megadrive
Alien Swarm: Reactive Drop
Twisted Metal Head On PSP version
Killzone: Liberation
Arcanum
The Takeover
Street Riders
Star Hawk

So many good games in this thread! I have one I have been playing that I really enjoy: Outland
It's a great platformer with tight control and beautiful art, and only 546 reviews.

Also I don't know if free games count, but I just played Fausts Alptraum. It's RPGMaker and can be very wordy so it's definitely not for everyone but worth checking out if you like the gerne imo.

Call of Juarez - old game but brilliant. The controls are a bit clunky. The story is very good (ending is too complicated though) and gameplay is nice. Quest varies nicely and you don't get bored quickly by doing the same over and over again :)
Epistory - very nice and charming game. Controls might be clunky sometimes but it's rather rare. Story is nice too although it might not seem like it at the beginning :)
The Last Door - great, great atmospheric games. Interesting story and beautiful pixel art <3
Quell - nice, relaxing casual puzzle game. Very simple idea but well executed. The puzzles are getting a bit harder after each level. Might get boring if you'd like to finish it quickly but really pleasant to solve 2-3 puzzles between other activities to relax :)
Hue - clever game. Really enjoyable and well made. Perfect timing in raising difficulty and adding new "features", perfect lenght of the game, not too long not too short - I didn't get bored even for a second :)
Dyscourse - controls are clunky but the game is pretty cool and quite funny :) Nothing innovative but still a pleasant game :)