Source: http://strategy.wikimedia.org/wiki/Strategic_Plan/Movement_P...
Last financial report: http://wikimediafoundation.org/wiki/Financial_Reports/Financ...
Two good times to recommend alternative charities: (i) on threads where people ask, "where should I donate my money", and (ii) on threads about disasters, when you have an opportunity to spur donations to targeted charities.
You almost certainly didn't mean anything by this comment, but you generally want to avoid the appearance of litigating someone's good deed as a missed opportunity to do a better deed. Donations to Wikimedia are a good thing, worthy of congratulations.
I was also a little disappointed to see Wikimedia called a 'charity'. Because people ask you for money does not make them a worthy cause. Now, I'm sure Wikimedia is doing what they do out of the goodness of their hearts. But its not the same as feeding the hungry. In fact, its kind of a first-world problem being solved, isn't it?
Your unfair question basically boils down to "My worthy cause is more worthy than your worthy cause!"