I don't get it either...it used to be, you'd have to build slowly and steadily up to a major summer tentpole that costs $200 million, but nowadays, studios will hand the keys over to virtually ANYONE.

And not even
good indie filmmakers are chosen that often...like Andy said,
Safety Not Guaranteed was an immensely forgettable film (all I remember were Aubrey Plaza's eyes), and yet Universal and Disney were both like, "Yes, this is EXACTLY who we want to trust our huge blockbuster franchise to"? At least with 1989's
Batman, Tim Burton was an unconventional choice, but had shown he could craft a visually exciting movie on a modest budget. What was there in, say,
(500) Days Of Summer (I movie I did like) that made Sony decide on Marc Webb to handle
The Amazing Spider-Man, aside from the happenstance of his surname?

I honestly think the only reason this is happening is because studios want someone they can keep their thumb on through the entire process, and who will not go apeshite with their money and will produce a proficient, agreeable product with a minimum of pesky auteurist style. Look at films like
John Carter or
The Lone Ranger, where Andrew Stanton and Gore Verbinski were given carte blanche to do anything they wanted with a minimum of studio interference, and basically lost a combined BILLION of Disney's investments.

That's why Edgar Wright was kicked off
Ant-Man, and they handed it off to the guy who made the modest hit
Bring It On...fifteen years ago. That's why Burton was kicked off the Batman franchise after the dark and morbid (yet fascinating and underrated (
Batman Returns and was replaced by uber-hack Joel Schumacher, who knew exactly what the studio wanted...toy shilling (and neon. And homoerotic subtext

).