I'm only going to name the one from most recent memory that I was disappointed in finding out would not be continued, Kingdoms of Amalur: Reckoning.
When I found out that Big Huge Games, the team in charge of KoA:R, was being shut down by its parent company, 38 Studios, I was disappointed, I mean I was just sifting through my game rack and put the game in. So hours passed, and I wanted to see its forum, only to find stories of Big Huge Games being shut down. And so here i am, sharing my most recent disappointment, however do not feel like you have to limit yourself to your most recent, you can tell of any of your faded games that deserved a sequel, or just more of, from any generation of video games.
Edit: Also it does not have to pertain to disappointment, but can be to praise it for what it had accomplished, and whether or not it should have been continued.