After reading through the recent "Greatest Game of All time" thread, it got me thinking back to some games I had such high hopes for and so much was promised, and then when it came down to the game itself, it left a strong 'meh' feeling. Not necessarily a bad game, but definitely not what you expected.

The game that fulfilled this for me completely would have to be Spore. I just remember having pre-ordered it and rushing home to play it, having to wait impatiently for it to install and go through the ridiculous DRM. It had some nice elements - the creative designing of your species and buildings etc was fun. The various stages were fun for awhile, but it just didnt have enough depth anywhere to get me really excited and hooked by it.

What's your biggest let-down in gaming?