Pretty disappointing. I feel like he had some chances to be aggressive without taking too many risks the past couple games and he passed them up to force an easy draw.
With that said it is now a 6 game match, the problem for Sergey if it is 12 draws is that he would still be a heavy underdog in the rapid/blitz tiebreaker as Magnus is the best in those time controls too. It might be nerve-racking for Magnus if it gets there but he'd still probably walk away with the title.