Have you played an MMORPG? I've done both (200 hours in a month of MMO, 200 hours in a month of TV), and I think the time spent on the MMORPG was far more of a waste.
It probably depends, but I'll add my 2 cents. Never done 200 hours of either in a month (really? 200 hours? that's insane), but after I went on my Dexter marathon, at least I'd seen Dexter. I still reference it all the time. The hours I spent on WoW were... well, I don't remember. That's probably your point.