I go back and forth on this one. On one hand, it does not really add anything and for a long time I did not really use it. There isn't much point without an appearance system (or a more crucial one). ...
I like clutter, it helps to give personality to a room and gives that lived in feeling, but I don't go overboard with it. I build to play in my lots, not to take pictures, and many times I decorate with stuff sims acquired in game.