There hasn't been a character dinner that we've wanted to write home about, but...plenty of character breakfasts that we can't wait to go back to.
We love Donald's Safari Breakfast at TH...we go every year, never miss it. Good selection of food and great POG juice, just like Boma and Kona. The kids always have a good time AND a good meal (plus it's a great place to see Daisy).
We also enjoy CP, the food is awesome...Puffed French Toast, made to order omelets and custom pancakes

all so good.
My son worships the Little Einsteins, so we do the Playhouse Disney Breakfast. The food isn't outstanding, but it's a really fun atmosphere and seeing my kids having fun with their idols, is worth every penny.
We had the BEST view of the castle at the Lilo and Stitch Breakfast at O'hana. Stitch was everything we'd thought he would be, totally crazy and fun, and the family style servings were a nice change of pace from buffets.
CM was good, but loud and crazy. It was nice however to see the Fab 5 and be able to skip the lines to see them in the parks.
We've done the Storybook Princess Breakfast at EPCOT. I thought it was a good value for the money (1 credit on the
DDP which includes a picture package). Plus, if you have a princess in training, it's a must!
IMO there's really not a bad character meal on property. Some are just better than others. Good luck!