I have a hard time being grateful for things I don't like. Experiences that are hard don't really bring gratitude to mind. But really, trials make us gratefuller (is that a word?) for the good times. We also grow in empathy for others through hardship.
Don't know why I am posting about trials after a perfectly lovely thanksgiving, but I do think I am ultimately grateful for hard times. This usually happens long after the trial or tribulation, but it usually happens. It's a hard fought gratitude, and hopefully more worth the earning because of it.