He says the Marvel movies are more violent than his films, which is only true in a context of scale. However, scale is not the only way we measure violence. Gore, its realism, the length of a violent act, staging and music, etc-- these things matter, and he uses them more egregiously than Marvel does. I'd let my 4-year old nephew watch any Marvel film well before Passion.
He then goes on to say that people at least care about his characters, the implication of which people don't care about Marvel's cast, which...isn't really true either? Like, people actually do like and care about Iron Man, Captain America, Thor, Loki, and the rest of these guys to varying degrees. That's half the reason we go see these films. The fact that the relationship may be too facile for his tastes doesn't mean it's non-existent.
If his point is that violence has no consequence in the films... that's also not true? Violence, if nothing else, is the means to the end that nearly every conflict is solved, and the lens that every conflict is filtered through which culminates in Civil War's philosophical underpinnings. Violence in comic books more often than not wins you the day, and it's because of its power at solving crises that makes it ripe for being a point of contention itself. "When should we use it? When should we not use it? Have we been wrong in using it before? Are there other ways to solve this problem?" So it definitely has consequence, but it's not a realistic consequence in that it results in some sort of permanence within the universe outside of minor bad guys dying. But then again, these aren't realistic movies. They're movies based upon a near century's old universe of weird-ass people in weird-ass costumes with weird-ass powers beating the shit out of each other because that's what kids like.
Also, can we please stop acting like everyone forgave Mel and the remarks about the MCU have triggered anything? He can say whatever he wants about the MCU, particularly since his complaints aren't actually novel. I don't give a shit about that; I still do give a shit about him talking about his wife being raped by a "pack of niggers," and no I don't think his directorial talents make that comment perfectly cool. So regardless of his thoughts about the MCU, he can still go fuck himself.