I'm still beating all of my "skill issues" out with OpenToonz, but I gotta admit I'm a lot better at it than I was a week ago. (If Miyazaki made it, and Groening uses it, and a guy has issues with it; then it's time for that guy to swallow his pride and learn something.)
Now that I know what I'm doing, it is definitely the most terrifyingly powerful piece of media software I have ever used. I love it. I still have tools and techniques to figure out, too.