I think you're sort of missing the point of the post, if it's mine you're referring to. The point I was making is that it's not really the line/writing itself that makes a memorable quote, it's everything around it. The reason that line from Jaws is particularly memorable is because it's unexpected, delivered well and it sticks out in the context of that scene (and the film), not because it's a particularly clever line. If it was an ad-lib where the actor decided to try a quip and they kept it because worked, that sort of proves my point. In a Marvel film, that line would always be a quip and we'd all be expecting one because that's what happens in those situations in Marvel films. Even if they went all out and wrote something better than the usual "Well THAT just happened" kinda thing, it'd be unlikely to stick out as an individual line because it's so predictable, and because it'll be one of several similar moments in the film.
Having said that, I agree that "Marvel films don't have memorable dialogue" is a weak criticism, even if I broadly agree with the statement. The idea that memorable dialogue is what makes a film good or bad is daft. That's no better summed up then in the video posted further up where the guy is seemingly earnestly arguing Aquaman isn't as good as The Godfather on the grounds that no-one can remember any lines from Aquaman.
