In my case, Facebook has become a daily routine where I post and interact with my friends. My profile is my presence to them. There first glance show them who I am but, what about my wall? Your wall is what you convey and speak to them. Therefore, I keep it clean from Facebook games and apps like below: In my opinion, this obstructs the view you give to people and shy's them away.
Every time I see a Facebook app or game has posted something on my wall, that I do not like, I block it by right clicking on the "X" and then select "Block...". From now on the app or game will not have permission to post on my wall.