Was Montezuma II a good ruler?

It depends on your point of view if he was good or bad but I can tell what he did during his government.

Montezuma basically tried to separate the nobility (pipiltin) from the commoners (macehuales), he wanted more power so he boosted his own status. He replaced the officials appointed by his predecessor for his own followers

Montezuma always supported the nobility, over the commoners who weren't favored during his rule, for example he eliminated the right of the macehuales to wear special clothing if they proved themselves in battle.