I have purchased three brand new MagSafe 2 adapters directly from Apple, and they all get scalding hot. It's so hot that I feel it might start a fire if it were on paper or even a rug.
Also, can some explain what Liaat mean't when he said, "In my opinion if the Magsafe pins are not depressed, fully popped out and make firm contact with DC-in Board, the problem is 90% solved." It's unclear whether he means the pins should be pushed in or popped out. Which is it?