Responding to THIS item:
If, as the essay says, it's true that Marvel's Valkyrie and Grandmaster characters are even temporarily popular, it has nothing to do with how good they are, as characters. I for one think they're godawful. I like how the script skirts the fact that Imitation Valkyrie has evidently been capturing people to die in Grandmaster's games for some good little time, But hey, she can't be implicated in slavery and murder, because she represents GIRL POWER!
No, they're popular because Marvel knows how to sell even a crappy script with loads and loads of humor. People remember enjoying the laughs in RAGNAROK and so everything is ennobled thereby. This is the mainstreaming advantage of the MCU that the DCEU didn't quite get, Joss Whedon's belated employment notwithstanding.
Frankly, I think Geoff Johns is probably part of that problem, but that's me.