Unlike with DC, I don't think it'd be a good choice to let him run Marvel. However, he could still make some movies, for certain characters
• Thor 5: If we are getting this, I think Snyder should direct it. The character was made a joke, however, similarly to Superman, where Snyder focused more on his Kryptonian side, the same thing could be done with Thor, focusing on his godly side and aspects
• Hulk film: Snyder claimed his favorite Marvel character is Hulk and a WW Hulk film is rumored to be in development. Snyder would actually treat the Hulk with respect and not make him a joke. And he can pull off the rage empowerment as well.
• Ghost Rider: After watching some of his projects, I think he can pull off this film as well. I'm not sure about this one though.
• Silver Surfer: I mean, this is very obvious. For Silver Surfer, Zack Snyder would be my first choice. He can pull off the loneliest character in the universe, it's kinda his range.
So, should he make Marvel films?