Yes, it's a bit early to measure his performance since he probably hasn't even packed yet for the Big Move. But when he does, and the weight of the free world lands on his bony shoulders with the sharpest talons you can imagine, people will watch his first few moves like a hawk.
When that happens, please refer to this handy tool that compares the First 100 Days of other presidents in recent history. FDR created the Securities and Exchange Commission, JFK created the Peace Corps, Clinton signed the Family and Medical Leave Act and George Bush ... created the Faith-Based initiative and defended his decision to NOT sign the Kyoto Protocol.
So there's really nowhere to go but up here, Big O.