PS4 controller / Dualshock 4 for Mac not working
Okay, so I found out the problem, it is due to an app called USB Overdrive taking precedence over the controls of the DS4 controller. If you're like me and you happen to also have a gaming mouse (with no driver support from the maker, pffft Roccat Kova[+]) for FPS games, this app is probably installed on your Mac.
On USB Overdrive settings, don't enable "Any Gaming, Any Application". This is the culprit.
I tried the controller on Steam's Big Picture and also Monaco after and it worked.