Ranger bow: Why does it feel better to use Rain of Arrow early levels?

Im a casual player, but I have only played Ranger with bow. I have tried to follow a few guides (Toxic Rain, Tornado Shot + Ice, Tornado + Barrage, etc). The thing is, everytime I level up a new character, it just feels better (fast clear an dps?) using Rain of Arrow. Why? Is it just a feeling?

This is my tree right now --> Tree

I don't know how to print my inventory...

EDIT: