Disney doesn't guarantee anything, beyond entry. I mean read the description of Chef Mickey's, they say you can enjoy the meal with "disney friends" and get "photos and autographs", but they aren't guaranteeing you anything, even though its in writing that you are supposed to enjoy photos and autographs.
But Disney doesn't say how many "Disney Friends" nor do I think it says Which Friends. It doesn't say how long you are going to spend with them, or how much they will interact with your party. Are you saying that if only one came by and gave you a high five and then walked away "No reason to complain" because Disney didn't guarantee you anything.
Or if they decide to shut down all the attractions in MK but still let you in ... totally cool, no basis for complaint because disney didn't guarantee you anything beyond park entry.
Saying "for those who want autographs they get cards" .... then "Everyone wins" ... no no they don't. The people who used to pay $XX amount of money and got autographs, and now pay $XX amount of money and don't, they lose.