My unsolicited opinion on the Make-A-Wish Foundation, in a nutshell: Excluding organizations that purposefully harm other human beings, I am not sure that there are many other organizations that are worse than the Make-A-Wish Foundation.
To explain: I identify as an Effective Altruist. I believe that saving lives is good, that doing good matters, and that saving more lives is better than saving less: if you have the opportunity to save five people, but you misuse your money so that you only save three people, then you have effectively killed two people.