Wouldn't recommend it as a MNK, later instances require you to be mixing and matching, silencing boss mobs, stunning mobs in other's, and some of the combo's you need to put out will be slightly different in each instance. I guess the main combo would be a good macro, if you're really that tired of spamming it 3 times, but a good monk always drops what dots he has, as well as any buffs, which means you'll only be using the main combo about 3 times before you have to re-apply those said buffs and dots. As well as the time loss of it being faster doing it yourself stacking up.

tl;Dr You'll need versatility later on which isn't the most ideal place for macro's I personally think for MNK.