This is why I have a problem with adfly/mediafire/any other pennies for clicks site. Some of those 'adverts' are really convincing.Those false adverts, big clickies, etc. are why my gf is not allowed to touch my computer. I spend several hours every few months having to clean viruses off her laptop.
It's also entirely why I downloaded the CurseClient in the first place (for WoW). I felt it was a far safer way than possibly clicking a malicious link manually downloading my addons every update.
I've also never had a problem with any Curse site (MCF, WoW stuff) giving me those shady adverts. It's usually pretty stinkin' obvious what's an advertisement.
I really don't understand why anyone has a problem with Curse, or that Slow is working toward trying to do what he thinks is best.