For example:

I’m a big fan of Wikipedia. I spent countless hours writing articles in my early twenties. I stopped because the environment got more hostile as the site grew in popularity. I think that might have been necessary to address the influx of drive-by editing, but it still meant I stopped enjoying being a contributor. I don’t appreciate the constant asking for money — as far as I understand, they’re well off without donations.

There.

I think the misconception here is that criticism has to be mean and personal. As someone who celebrates the project’s ideals, giving criticism is an act of love.