The only odd thing about the draw was that Carlsen didnt play on until move 38 or 39. Carlsen knows that he's a strong favourite in the tiebreaker. All he had to do was draw all the games in the classical time control. Carlsen was playing black. He had a strong position, but nothing obviously winning. Why take a chance on things going awry in the classical when you're an 80%+ favourite in the tiebreaker? He knew Caruana would be highly pressured to draw if he offered. The draw wasn't good for chess, but it was good for Carlsen.