Swing states are the states most likely to have divided government. And if divided government is good for anything, it is accountability. So with the Electoral College system, when we do wind up with a razor-thin margin in an election, it is likely to happen in a state where both parties hold some power, rather than in a state controlled by one party. The Electoral college system focuses a great deal of energy on states in this condition when an election is close.
National Popular Vote (NPV) rewards states with high population - the higher the turnout, the more power for that state. Additionally, under NPV, each state would certify its own "national" vote total. What would happen when there are charges of skullduggery? Would states really trust, with no power to verify, other state’s returns?
I have other concerns as well but feel the EC system is superior. Just as an observation, the parliamentary systems of the UK, Canada, Israel, (& others) have the parliament elect the Prime Minister and likewise don't elect their leaders by popular vote.
[edited: removing poor wording about 'lax laws', seems I implied things in a FUD way that I didn't mean to]