Facebook games are quite a past time for many people. 80% of the games on Facebook are indeed boring and they don't even last after a while. Some games like Farmville and Angry Birds would have quite a following or community.

But we can't come to conclusions about these in general since it's always to each his own. There could be some games that some people like. Most people tend to like a few popular games. Some people never play games at all.

Whether someone likes a game or not and as to why they spend time playing games is another science that has a lot to do with 'gamification theory'. People like games since they are easy, relaxing, and most games are designed to delight and invigorate.

In games, behavior is rewarded. That's what people want. To bore through the various levels, achieve accolades, point and shoot, kill and slay, or navigate their way through deserted nuclear research centers killing monsters.