To take just one source is unfair. You need to look up a lot of separate independent reviews to get a hold on a more balanced picture. All A/V products have their successes and failures and personally, I think it boils down to a matter of personal preference as there will always be pros and cons to each brand.
People tend to adopt a product, like it and stick with it.
The best place for this discussion would be on an independent anti-malware forum really.
I doubt anyone from McAfee will respond here as these forums are mainly for peer-to-peer product support.