I feel you, Crossbones was an awesome show. I was also disappointed when it got cancelled. Another show that got axed too soon was Firefly. I was so devastated when it got cancelled.
Teen Titans is my favorite show that got cancelled. I wanted a Season 6 to happen back in the day, I filled out and mailed paper petitions in 2005 to try and keep it from not getting cancelled but that didn't work.