I agree with Vala in that "fun" is open to interpretation. I have not been to the Lilo and Stitch breakfast yet, but I have done the Storytellers character breakfast twice. Now, food ratings aside, in terms of atmosphere I would not exactly say that Storytellers was a rollicking good time. Not exactly. That doesn't mean that it is....well....un-fun, by any stretch of the imagination. It is just, as Vala said, a more relaxed environment. It is quiet and warm and earthy. Like, for example, at Goofy's - even though I don't think Goofy's is overly wild and chaotic like some folks do - the set-up seems right for characters to roam the restaurant and be zany, and the characters seem to belong there, and are encouraged to be zany. The restaurant seems to be there for the characters to sort of have the spotlight. At Storytellers, it almost feels like a few characters - some of whom you may or may not recognize - just happened to wander into this little cozy place and decided to visit with some customers. It doesn't have the feel, to me, of a 'fun' character meal. You may prefer the atmosphere there more than at the other ones you have tried. It's all personal choice. I like character meals in general, and I like Storytellers as a basic, non-character restaurant at lunch or dinner, for the most part, but for some reason, the character meal at Storytellers does not fully work for me. It could be the characters - I don't care too much about Koda and Kenai or Terk, and the ones I love - Chip and Dale and Baloo - can all be found over at Goofy's. The Storytellers food was good, but it didn't make me yearn to go back there for another character breakfast.
I have a feeling that, on the fun-o-meter of character meals, Lilo and Stitch would probably rank higher than Storytellers. That is not to say that Storytellers isn't worth a try - it's just a different vibe there than what you may be used to at Goofy's and Minnie's.