Some parts of Judaism are logical and fit into our modern mindsets. Other parts seem to be totaly illogical and somewhat outdated. And so, we tend to pick and choose what we feel comfortable observing and what not. The truth is, however, that both types of commandments are equally important; ultimately they are both the direct word of G-d in the Torah. Sometimes we observe Jewish practices because it 'talks to us', and othertimes we observe them because G-d said so.