Two things set off the grind alarm in my head: The monthly fee and the Fun factor.

I know WoW Wants my 15 bucks. I know it has been meticulously tweaked to trigger my gamblers instinct to hit a lever 100 times if a food pellet falls out 1% of the time. If what I am doing in games has even the faintest whiff of 'you could have done this part of the game in half an hour but we made you do it in 8 hours so you won't cancel your subscription for another month' I am outta there. Wow, Aion, etc. etc. have this stink in spades.

And with any game, from flash based puzzle to fancy alternate reality mmo is not worth playing if you are not having fun. Clicking 1-2-3 over and over while eating a sandwich and watching a rifftrax may be fun but it's not the game providing the entertainment there. If the actions I am taking to play the game are not in and of themselves enjoyable, just a means to an end the is enjoyable then to the dumpster it shall go.