Nolan's movies mostly stay on the wrong side of self-seriousness.
But are they really? Though the storytelling can be a bit heavy-handed at times, all of the themes in the three movies are 100% Batman related and fit perfectly into that character's mythos. Even all of the political themes of TDKR are drawn directly from the comics. Also, the brooding, nihilistic tones of the films(especially TDK) are very fitting for a Batman story. Putting it all into a "real world" stylisation, only makes this elseworld interpretation more unique.
I find, that the "self-serious" reputation, comes not from the movies, but rather from the whole media craze and hype, that has grown around them. The films(again, especially TDK) generated such a different vibe from the rest of the superhero genre, at the time of premiere, that viewers and critics alike, started throwing around words like "serious", "political", "topical", "zetigeist" in such quantities, that it has warped the way these films are viewed by the public.
I wouldn't call this trilogy self-serious. Like I said, the narration can be crude and heavy-handed at times, but there are no unnecessary political themes, that would be out of place in a Batman movie, while the "seriousness" of the plot, only serves to make it more compeling.
Marvel films are fun and all, but often when I read comments prasing movies like "Avengers", for their unrestrained comic-book style, it seems to me that it is just a reactionary, allergic response to all this talk of serious superhero films. I mean we had campy and cartoony superhero films for decades now, and few people ever considered them to be anything worthwhile, other than fans of the source material. But all of a sudden, this over-the-top kitschiness is supposed to be actually preferable to the more serious approach? I don't buy it.
It seems to me, that many of the people demanding, a more comic-like Batman, do so not becouse Nolans vision is bad, but becouse this whole media craze around his films, has made their usual choice of movie entertainment seem cheap in comparison.
The Trilogy is complete. Nolan's Bat-flicks hype will slowly fade away, Marvel will take over and after a short period of time, people all over the world, will once again start grumbling that superhero genre is killing the cinema. That if You're not sentimental about the source material, then all this comic-book style is just unbearable, campy just kitsch and that Marvel releases the same, cookie-cutter products every summer. Who's willing to make a long-term bet?
