Video game cancellations that made you upset

[HoloDust]

Omikron 2 - Nomad Soul is still one of my all time favorites, and I was pretty pissed when they postponed it and later canceled it in favor of Heavy Rain. Still hope that Cage will eventually revisit that world (and gameplay, while we're at it).

Project Offset, it looked great and it seemed like it has good story and gameplay, then Intel bought them to be showcase for Larrabee, once that died, game died too.

Off course, for me personally, nothing beats cancellation of Interplay's Fallout 3 (Van Buren) and Bethesda's acquiring Fallout IP.