I see a lot of the issues being raised as rather irrelevant. Whether restaurants in the United States in general, or at Walt Disney World specifically, are highly profitable or not doesn't affect whether or not they should comply with our society's principles for paying restaurant service staff.
Society dictates how little restaurant servers get paid. Society dictates that the cost of service provided by restaurant servers is to be substantially separate from the menu price. I see no foundation on which to criticize a specific restaurant or set of restaurants for doing either. Criticize society if you wish, but be sure to make sure that your criticisms clearly indicate that it is society that you're criticizing or someone will invariably misinterpret what you're trying to say, and reply to your message as if you said something that perhaps you didn't intend to imply.
The only things that are different about the Disney situation is that Disney is automatically charging a mandatory 18% (that's actually three things: the automatic-ness, the mandatory-ness, and the 18% versus 15%) under specific circumstances. Those are the only bases on which I can see any defensible criticisms directed specifically at Disney being launched.
And even some of that isn't clear-cut: It is not uncommon, in our society, for large groups to be charged an automatic gratuity, so in that regard, the criticism of the practice itself seem off-target, unless directed at the fact that Disney is defining a large group as "six" (which is two less than what is common in our society) or at the fact that Disney is charging more than the standard gratuity.
I hope this helps some folks understand why their criticisms are being assailed, and/or helps make it clear that when people assail a criticism, they're not defending the entirety of what Disney is doing, but rather perhaps defending Disney with regard strictly to what they inferred you criticism was focused on.
I don't find them irrevelant at all.
I am approaching this differently since I see my family use absolutely top-notch ingredients at all times (my dad uses 7 different kinds of tomatoes just for his sauce), as well as deal with high wages and taxes to contend with, whereas Disney doesn't necessarily have these issues to deal with, but they get so much more money for their products, so it's easier for them to make a profit. My family's top priority is food quality, but at some Disney restaurants, this is definitely not the case.
I guess I'm biased and a bit protective of my family's hard work.

I honestly didn't know that Disney's servers got paid that little - good for the company, but not so good for the servers. By the way, my hubby and I always tip, even if bad service because tips are pretty much expected in our countries - especially in yours as we have to supplement wages.
This is my issue - Disney won't necessarily see that patrons are unhappy with quality of food as they get their money, yet, many patrons give less of a tip to the people who served the lousy food. This is my issue - I shouldn't have to supplement wages that much ($2.00/hour for servers is a lot of supplementing) as then the restaurant is never going to feel it - servers are tipped for great food when they never made it, yet, they are also tipped less for kitchen or food problems, and this is a problem for me, and I'm sure many servers as well. Eg. I had a horrible meal at Chef Mickey's for 2 reasons: 1) Terrible food and 2) Terrible service. The server still got her tip, although not quite 18%, which was our way of dealing with the bad service, but what about the bad food? It would not have been fair for me to give her less tip because the food was so lousy, as she had nothing to do with that. Chef Mickey's has been getting horrible reviews, yet they are still packed. Will the food quality improve if this is the case? Probably not. I honestly feel that if Disney paid higher hourly wages, then they would put more improvements into their food products, as this is a direct cost of doing business, wherease when it's automatic, this responsibility has been passed to the customer, and that should not be solely my responsibility, KWIM?
Not sure what the answer is, but in my opinion, Disney restaurants are making out very well since they have now passed tipping to customers - this will surely give them less motivation to provide stellar products, as the gap between product vs. service is getting wider and wider, whereas at my family's restaurants, it's a closer relationship and one that is better for patrons and staff - kitchen and servers are paid well; therefore, they both have motivation to provide good products and service, whereas at Disney, I don't see this happening. I read tons of posts on here where people have stiffed the servers because the prices of the food are too high, and the quality isn't good, and that has nothing to do with the servers. That is Disney's responsibility, yet they are passing it onto the servers and the patrons, and that in my humble opinion, is not good.
Tiger