It's not all sword fights with comedy actors. There are scenes of straight comedy as well, such as when Dan Aykroyd convinces Garrett Morris to dress up like Thor to fool the Silver Samurai's thugs. As "Thor" tries to convince them he's the real deal, Murray and Radner electrocute them with lighting equipment.
The thugs' response predicted the internet's reaction to every non-white-male reboot of a Marvel character 40 years ahead of time.
The SNL cast ends up slaughtering the entirety of Silver Samurai's gang, while Spider-Man gets beaten through all their expensive sets. Spider-Man is such a shitty superhero in this comic that the audience actually believes he's just part of a sketch. And he'd absolutely be dead if not for the bravery of Belushi, who dresses up like his samurai character to start a full-on two-page sword fight with a supervillain.
In Marvel's defense, this is absolutely something John Belushi would do.