The problem with this logic is believing that Depth = Quality. Or that the only measure of quality is depth, to be more precise. I also think you're only applying the word "blockbuster" to brainless action movies. I only mean blockbuster in the sense of a movie being successful. The word doesn't attach itself to a particular type of movie technically. It just tends to apply to those summer blockbuster movies with a ton of action and visual effects. But not all successful movies are like that, obviously.Not really, the fact is there's two types of movies, and generally blockbuster movies are more on the surface, but author's cinema is different, and is way more deep than any blockbuster movie period. Even if you have some blockbuster trying to be deep, it can never be as deep as an author film. It's a matter of preference in the end, and right now the most successful movies are blockbusters filled with brainless action. We can't judge a whole genre on simply a few movies, we judge it on the majority of the films, and in the case of author movies there aren't many that have brainless action either. Like someone said blockbusters don't win the oscars for best movie or rarely, so they're just good to fill the pockets of movie studios with money.
Doesn't mean I don't watch blockbusters, I watch a few a year, but I feel that author's films deserve more recognition, sadly they don't have the ressources nor the exposure needed to make it, and this is particularily the case in the US. Winning the oscars isn't enough, and it's not about being elitist. It's about choosing carefully what you watch, being picky I guess. I don't feel involved in the story of a blockbuster, however in some author films they bring out a lot of good points, and overall I feel more invested. Right now the studios in the US mostly are just cashing on franchises such as Avengers, and the few other choices aren't that good either. So I really don't see why people should give their money to these greedy studios, who more often than not are just rehashing the same stuff.There's no variety, and the themes aren't deep enough.
And even if a particular movie is, like in the case of Fury Road (at least ostensibly), this doesn't mean it can't be of amazing quality IMO.
And while I'm sort of an anti-hype type of person, I try to divorce the movie from the studio or whoever is responsible for creating it. A movie has to be able to stand on it's own. I mean, it's difficult since a lot of filmmakers have awful reputations when it comes to substance and quality, but George Miller just isn't that kind of filmmaker.
Well, maybe I didn't fall for it. I liked Casino Royale a lot, saw Quantum of Solace only out of curiosity, but I don't think Skyfall was ever going to live up to the pre-release hype for it. I really didn't have much of an interest in seeing it and still haven't.

I know Mad Max is the most recent blockbuster but still...