I have to disagree with this. At my current job I deal with a lot of Mac malware/adware, and fully removing it is complicated process. After clearing the applications folder and removing browser extensions, you have to check a lot of folders, and you kind of have to know what you're looking for. In /Library/ for example, you have to check Application Support, Extensions, Frameworks, LaunchAgents, LaunchDaemons, PreferencePanes, and StartupItems. I like OSX, but it definitely needs a MalwareBytes equivalent.