I hated pets when I first got started in MMORPGs. Pets in early MMOs had such terrible AI and were such a nuisance to control that they gave their masters bad reputations for years to come.
A couple of games changed my mind along the way, though: Guild Wars 1 and Titan Quest, and maybe Hellgate London too. While not all MMORPGs, they all had extremely powerful summoning classes that basically made the game into a steamrolling experience where the player had to do very little but keep the summons coming. By the time City of Heroes added Masterminds, I was actively seeking out a class I once looked down on.
What pet classes and summoning classes have you enjoyed in MMOs? What’s the very best pet class in an MMORPG?