The EC has nothing to do with checks and balances, that's the three branches.
It's broken because votes aren't equal.
The minority is ruling the majority. The fact that 3 million more people vote for Clinton over Trump, yet he still won, shows how it's broken.
The will of the people was to have Clinton as president and the EC prevented that.
This is exactly why I wanted a Democrat to state as a rebuttal to the Republican "circumventing the will of the People" talking point that the Electoral College circumvented the will of the People in 2016 by putting Trump in the White House.