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8. Darkfall Online - 8 Years
Though an ambitious piece of design work, Darkfall was one MMO that saw its downfall through a protracted development cycle. Eight years is a huge amount of time, even by MMO standards, made even worse by how many promises developer Aventurine made regarding Darkfall's gameplay elements. Spoiler alert, most of these promised elements didn't make it into the final version of the game, an issue that, combined with an overall lack of polish and testing, made Darkfall a bit of an embarrassment.
