You'll need to put more time in learning Unity + Playmaker compared to something like GameSalad. But once get hang of it and familiarize yourself with it's possibilities. It's quite easy to use.

Instead of a single "if this then that" event list which can become very cluttered beyond the most basic behaviors, PlayMaker gives each object a list of states where only certain events are triggered, and performing an action also changes state.

This allows for a clean, simple visual representation which helps break complex logical structures into smaller pieces, making them easier to understand.

It basically can do same things as scripting in Unity.

A lot of third party plugins have support for Playmaker. Playmaker team also invest time to add support for a lot of third party plugins.