That's true, although I think the self contained adventures you do in small groups are the fun part, the massively multiplayer element is just a little extra, and considering how much it costs to run a MMO server setup, compared to the small games which people could run on their home connections the purely group based games seem to make more sense.
Helm, blocking commands would not work too well for multiplayer, true, but you don't have to use them if you don't want to.
Helm, blocking commands would not work too well for multiplayer, true, but you don't have to use them if you don't want to.