I can't recall a moment where Saitama hasn't saved the day yet: House of Evolution, Sonic, Seaweed Monster, Meteor, Sea King, and I 100% predict Saitama will be the one who beats the Dominator space dude with anime hair. I'm sure the other S class heroes will do stuff but that's all they should do because, really, they are nothing to Saitama other than "can I have some tea?" room guests. The only people that seem to matter in this show are Saitama, Genos, Licenceless Rider, the Hero Association, and the villains. Every one else serves as exposition or filler hence an entire episode of 2 hero jobbers fighting a sea weed monster and then Saitama kills it when returning home with groceries.
It's arguable to say the filler is the content but even then the filler has zero weight to it since Saitama is going to show up regardless at the end and one-punch the guy. This is why Saitama is both good and bad for the show. I guess they're trying to balance it out but unless the heroes are able to take down a big bad then it's hard to consider them anything but filler. It's good for what it is but it's a big drag for me: you have these cool concepts for heroes but then they get jobbed by the actual bad. I feel as if the tiny little green girl is going to get jobbed by Dominator dude even though she can chuck meteors at godzilla. I could probably cut any scene that doesn't have Saitama in it and I'd get the entire story regardless.