We can make judgments about leisure activities just as we can about any other part of life. Playing sports, reading novels, and watching (good) movies can all make you a healthier, more reflective person, while being intrinsically entertaining. Even WoW, while it has some disturbing aspects, has the wonder of exploring a fantasy world, online society, and some strategy.

I don't play Farmville but I don't know of anyone that argues it's time well spent. Players don't even seem to be having "fun" by any normal definition. At best, it exploits social rewards to make you conform to the game makers' agenda.

Perhaps it's closer to fashion than recreation; where you're on a consumption treadmill that's largely controlled by others. Without the consolation of having nice clothes or looking any better.