RPGs should always have strong plots, but the MMORPGs I've played tend to lack any seriously compelling narrative. Most of them, from what I've seen and been told, are simply random quests to go kill X number of A monsters, for seemingly no reason. I guess what I'm saying is that I don't see the point of these games. In shooters you defeat your enemies, in puzzle games you solve puzzles, in real RPGs you complete the story, but the only thing I can come up with for MMORPGs is get to a very high level and act superior to everyone else.
Every time I try to play a MMO like World of Warcraft, I just can't help but think how much work it is, and think of playing another game. And when that happens, I just give up and go play something more fun.