I strongly believe criticism should be constructive and positive. Lately, Apple and its supporters have been bashing Microsoft using misinformation.
Take a look at this post from Jeff Jones' blog over at TechNet. He ran into an Apple evangelist at the recent Black Hat conference who quoted a percentage of Windows systems with security issues, yet could not state the source.
Why not remain silent if you can't substantiate your comments? (sigh)
More on this to come.