The Russo Brothers were basically given free rein and damn near an unlimited budget to do whatever the hell they wanted on The Gray Man. That's kind of Netflix's MO, to basically just get out of the way and let filmmakers do whatever they want, hence the amount of bad movies they put out. Turns out, as much as the traditional studios suck, they *do* provide crucial guardrails and often keep filmmakers from indulging their worst tendencies.
Without Feige at the helm, and the iconic Marvel branding to work with, the Russo Brothers proved to be pretty bad, and very bland filmmakers, as Cherry (made for Apple) was terrible and The Gray Man really was just the most generic, vanilla thing ever. I'm sure they'll do a serviceable if not good job again here, it's just kind of disappointing that Marvel couldn't find anyone else.