I'd say yes. The Marvel Star Wars comics have a lot to offer. They bring new perspectives to the franchise and the illustrations are top-notch. But, as with any comic, some people might have different tastes.
No, Star Wars Marvel comics are not considered canon. Canon refers to the official and accepted storyline within the Star Wars universe, and these comics often exist outside of that framework.
They attract a different audience. People who are fans of graphic novels might not have been into Star Wars before, but these Marvel graphic novels can draw them in. Also, they allow for different interpretations of the story. Artists and writers can take creative liberties within the Star Wars universe and show things in a new light. For instance, they can explore what a certain character was doing during a particular event in the movies from a different perspective.
Yoda is not a regular presence in Marvel Comics' Star Wars. The comic series usually centers around different storylines and characters, and Yoda might not fit into those specific narratives.
Not all of them. Some Star Wars Marvel comics are canon, while others are not. It depends on various factors like the storyline and its alignment with the official Star Wars canon.