What is your favorite and least favorite combat CD skill in the game?

[CKNovel]

Drill.

It's magnificient, it has a nice animation and the design behind it is genius.
You want as much as possible Drills so you need to balance Heat and Drill usage.

Drill is the essence of Machinist.

Least favorite is... Huuuh... Wildfire or Flamethrower...
Flamethrower. It's only used to greed a 100 potency tick on a boss return or AoE.
You press the button, you don't touch anything for 10 seconds. And it's the lv70 Ability, something that often define the job and its rotation.

Take GNB's continuation, War's inner release, Blackest Night, Nastrong, Hissatsu: Guren&Senei...