It's different tastes. MMOs are great for making new friends across the world. And if you are just going to play the game by yourself and kill monsters all day then yes, it will be boring. But I've made some great new friends and the adventures I've had in some MMOs are amazing and funny to look back on. You have a blast on the game when you play with friends. That's what it's all about. Which is why I dont play the game for more than 6 hours unless Im having a blast. I never let it run me. But just because the game kills off a few dumbasses with no lives, doesnt make it a bad game.
I grew up playing games like DQ, FF, CT, SoM, all the rpgs on NES and SNES and even PS1. I grew up leveling up and getting treasure. It was only natural I moved to MMORPGs eventually. And in many respects they are better because you meet some great people on the game of all ages.