I think the opening shows its age a little. It demonstrates guts to be a hypermasculine psycho which, in fairness, he is at this low point in his character, but I don't really feel having sex with an apostle is consistent with the rest of guts' character. You can headcannon (hah) what circumstances would bring out this behaviour in guts but fundamentally, I feel that making this the opening scene leads the naive reader to associate guts with a kind of macho sexuality (he's using sex and explosions as tandem weapons ffs) that is at odds with what we later learn about him. Plus it probably turns off a lot of readers who would otherwise love the series. I think the mysterious introduction given to guts in the 1997 show is a better hook. He still comes off as a badass and a psycho (he steps on the knife embedded into a dude's shoulder! Iss nasty!) but without the edgy sex-and-guns vibe.