Hundred fists

[Dawiichan]

I'm planning on lvling MNK, but not sure how well it performs in instance raids, NMs, Ifrit, etc... any advice?

Focus on two different things if possible.
1)Strongest Mob
2)Mobs weak to Fire/Earth/Wind

You wont be able to kill the weak ones as fast as other classes, might as well take advantage of your single target capabilities. Other than that, survive.

As for the fists starting at 00:13, you also have to remember that :00 stay up for a bit.