Is Calvinism Practical?

After Stewie makes fun of the Professor for a host of reasons, the discussion picks up where it left off on John Piper's introduction to Calvinism as he speaks of its practicality in ministry. How teniable is the belief that all our choices are actually determined by God?  Does it really help us? In a culture that blames God and runs to sin rather than blaming sin and running to God, does the Calvinistic system help bolster the false notion that God is to blame for the evil, fallenness and all...