Both Clinton and Trump were nominated as Presidential candidates by the voting public through a democratic process. Voters will choose among Trump, Clinton, Stein, Johnson, and other candidates in the Presidential election on November 8th. If voters don't want to elect Trump or Clinton, they have other candidates they can vote for. The reality is that most people want either Trump or Clinton as President.
Can you remind me how Prime Ministers are chosen in your country? What voters choose them to be PM? How important is your national government relative to the national government in the US, domestically speaking? Are state and provincial governments as powerful as they are in the US? Do you elect all your state and local offices, like we do in the US?
The US has many problems, but "insufficiently democratic" is not one of them.