Old post is old but whatever. No, he's not hot (though that's obviously just one person's opinion). He's hot for a chess player. That's not the same. He does look a bit neanderthalish as others have pointed out. But most of his attractiveness comes in his confidence and intelligence. I'd say he's cute in his own way. But being successful is attractive in its own right. It typically means you're intelligent, driven, and confident. Which are three checkmarks for a lot of women. And he's better looking than most of the other top tier chess players. Throw in well-spoken and well-dressed and that's why his looks get the attention they do. Wesley So is better looking in my opinion. Karjakin's not bad, but he seems to have an awkward personality. Giri's kinda cute but he looks more like a friend's little brother.
Is Carlsen good-looking?

All grandmasters have an awkward personality...it comes with the deal...you have to be a little mad to put so much time in chess....

Let us be objective about this. There is no way he would have become a male model if he were not World Chess Champion.
The question of whether or not women find him attractive is a different one. For that we cannot separate his appearance from whatever charisma he has to someone that knows of his achievements.

Carlsen (to my sister) is quite handsome. He has a I don't know how to put it...ruggedness. Channing Tatum had it too

The one in the right is cute, the one in the left is Magnus.
How about this girl BP?

First of all few questions:
-Carlsen has been selected one of the sexiest men on the world, but would that happen if he was lesser famous?
-Do women rate averagely-looking man handsome or sexy mostly because he is famous?
-Doesn't Carlsen look bit like a boxer? Is that handsome?
As heterosexual I am not of course the best person evaluate these things :) The handsomeness of Carlsen is far away from someone, say, Hugh Jackman's (even his past pics when he was same age).
Als this was marvelous! https://youtu.be/HaqohMDhi1c