>>714226239
>Colt Canyon
Little indie cowboy roguelike game that is just boring. Not enough guns, not enough info given to make good choices, too slow to move around.
>Brink
Obvious massive disappointment and shit game. I was promised cool parkour shooting game and I was young and dumb enough to be fooled by a trailer. I was playing TF2 at the time and realized how trash this was by comparison.
>Fallout 3: Mothership Zeta
Thought it was bullshit you couldn't get all the cool NPC gear at the end of the game unless you slaughter them all like a fucking psycho. Plus the vibe just wasn't that cool.
>Sir You Are Being Hunted
Really love the idea of this game. Survival horror of being a metaphorical fox in a foxhunt with robo gentleman hunting you down. Game was ugly and basic and lacked the tension and thrill promised by the games concept.

I'm sure I've played worse games but I don't remember them because they happened before steam and/or I barely played them. But these were all distinct disappointments that I can easily recall.