Dan Gilroy's been at this for a while now. His first produced screenplay was the largely-forgotten "Freejack," a science-fiction action movie starring Emilio Estevez, Mick Jagger, and a fresh-off-his-Oscar-win Anthony Hopkins in 1992. The other main co-star in the film was Rene Russo, who ended up married to Gilroy after that film, and now, a full 22 years later, she's co-starring in "Nightcrawler," which is Gilroy's move from being a writer to being a writer-director.
If this is any indication of what he can do when he's in full control, then let the era of Dan Gilroy commence.
Disturbing and dark, "Nightcrawler" is many things. It is a remarkable LA movie, something I would not say lightly. I have a lot of problems watching movies that are "about" LA, just like I have a lot of problems watching movies about making movies. I have trouble separating what I know from what I'm watching. It is also a pretty spot on savaging of news media and what runs the business.