Bernie was bad at articulating how he was going to get his policy made into law. His plans would require super majorities in all parts of government, in every state, to even maybe have a chance to work.
He totally lost me when he wanted every state to chip into college tuition reform. That isn't ever going to happen, so building your plan to work like that is asking for it to completely collapse when half the states just outright refuse to participate. His "plan" for banking reform was embarrassing.
Hillary has the best grasp on policy of any candidate we've had running for president in a generation.
Simply put, US is not ready to become an European social democratic country. Which is sad, cause it's the only way I would live in the US.