10. Brutal Legend
Double Fine's tale of a heavy metal roadie transported into a world inspired by iconic album covers seems to boast one of the surest visions of any game this generation, but Brutal Legend faced an unexpected identity crisis.
Advertised as a combat-centric action game – even the awesome playable demo confirmed that assumption – the game takes an odd twist towards real-time strategy as the campaign progresses, which turned off a lot of players and wasn't a well-known fact prior to release. If you didn't know it had RTS elements, could you possibly tell from this trailer? Probably not.