It's a sad truth indeed that some terrible games in the past have actually had seriously solid ideas. A good idea does not automatically mean a good game, as demonstrated countless times by an industry that, more often than not, produces the very best products when creativity is all but bankrupt. A real shame, but that's the truth of the matter.
Budget constraints, technological problems, or a simple case of being too ambitious for one's own good can all have an effect on a title, meaning that no matter how deep your narrative, unique your gimmicks, or breathtaking your vision, concept alone cannot save a game. With that wretched fact in mind, let's take a look at some examples of absolutely killer concepts that went wrong somewhere along the line and ended up as bad videogames.