Lol! While I have a feeling that dude is trolling, passive builds were both affective and popular in Titan Quest. I levelled a defence+warrior build in that game that used just three active skills, one of which I only used on bosses and rares.
Edit: my current conjurer pet build uses three pets, two toggle skills and three active skills, one used only on bosses. I mostly just use my mouse.
Edit: my current conjurer pet build uses three pets, two toggle skills and three active skills, one used only on bosses. I mostly just use my mouse.