What are the Major Flaws in the Electoral College?

The most glaring flaw is that the winner of a states popular vote receives all of that states electoral votes. That is regardless of the margin of victory. What is needed in order to better represent the will of the people is proportional sharing of electoral votes. It could be done based on the vote within congressional districts-the winner getting that districts electoral vote. The winner of the entire state vote would get the two electoral votes based on senatorial representation as well as those for each district won.