I really enjoyed WoW for a few months, after a friend convinced me and another friend to get it when Cataclysm came out. We all created new characters and leveled them, which took a decent amount of time to get through all the content in Outland, Northrend, and the new Cata zones. We then got pretty involved in dungeons, gearing up for raids, and PvP.
This was all fun. Being able to interact with real people made it less lonely than normal video games, and since it was all new to me, learning all the mechanics, professions, plot, and stuff from scratch was tons of fun. It was a huge, virtual world to explore. I didn’t mind the repetitive quests, since I always did them with a friend and we just chatted on Skype or whatever while we killed the requisite 50 butterflies. And for several months, there was always something new to try, some new place to go, some new ability to get, a new profession to learn, whatever. Eventually I created second character with a totally different playstyle (melee vs magic), and had fun leveling that one as well.
But once I got seriously into the end-game content, consisting of grinding out the same dungeons again and again, and “capping” our PvP points each week so that we could save up for another piece of imaginary gear, I found it boring, tiresome and ridiculous, and quit after about a month. I didn’t like the dungeons because they were all so repetitive, and it was frustrating to spend six hours grinding through a bunch of them and not get any loot, and I didn’t like PvP because I knew I would never care about it enough to devote enough time to it to get any good (memorizing each class’s abilities, counter-abilities, counter-counter-abilities, etc.) At this point, I had also mastered playing the auction house to amass massive amounts of gold, so there was no challenge left in that either. So I just terminated my account and quit. I haven’t looked back.
One thing I really liked about WoW was the design and art direction. It was a bright, happy, cheerful, fun place to be. It was pleasant to log in after a long day at work, in the middle of last year’s cold, dark winter, and spend an hour chatting with friends in Stormwind, queueing up for battlegrounds. Other MMO’s seem to try for a more “realistic” or gritty atmosphere, and it turns me off.