We love this and set it up every time we go to Universal. It doesn't seem to be terribly popular though, it's never been very crowded (we are there during the off season, but they only offer it Thursday and Sunday, so I would have thought it's be more crowded).
ANYWAY... we really enjoy it. The food is mediocre at best, it goes along the same quality as a hotel buffet breakfast. Tepid and bland. But if Thing 1 and Thing 2 are there, as I recall they DO serve green eggs with the ham
We go for the characters, Spiderman talks to you and he is GREAT! The kids are always beaming after he leaves the table. If we're at a booth he has a penchant to hop up on the bench back and surprise them which was cool.
Don't tell Thing 1 and Thing 2 NOT to do something, because chances are they WILL do it. Like pouring salt into my mom's coffee (she wasn't amused) but WE were!
The characters spend a good amount of time with you, to me it beats Disney character breakfasts every time because the restaurant is only so big and usually only half filled, so they aren't posing, signing and dashing to the next table.