> I noticed the missions were all similar with slight variations.
Quick disclaimer: I'm primarily talking about WoW here, since that's what I have personal experience with, but most of it should apply in other MMORPGs too, to some degree.
That's absolutely not false, especially as a new player, but at the same time it's not really representative of the "true" experience that people play it for. Yes, questing (especially on low levels) is mostly the same fetch quests over and over with dull combat.
But once (if) you do get past that, there is a much more engaging endgame, where you have 10-30 people (20 at the highest level) who need to execute slightly different strategies, at the same time, more or less flawlessly. Plus, there's all the management stuff in trying to have all those people not get too angry at each other, while hitting their heads against the same boss for hours upon hours, over the course of several days.
So no, they're not flawless, and the levelling process is dull, but it's not really representative of what appeals to us that do play them.