Playing God?

Al
The Children's Hospital of Philadelphia was just able to successfully grow a lamb outside of its mothers womb, in an artificial womb! Meaning that they grew a premature lamb, and grew it to full term in the artificial womb. Their hopes are to use them for preemies. Some scientists are seriously frowning upon this saying that you're either born, or you're not. You can't be half-birthed. There was also made mention, with technological advances, being able to implant babies in the artificial wombs at conception. 
With this technology, along with the ability to clone, do you think we are getting too close to playing God? At what point do we let nature take its course? 
UPDATE: They addressed that no baby earlier than 23 weeks gestation would be able to utilize this artificial womb (if it ever became available to humans).