I see where you're coming from. I feel the same way in many respects, but not quite to the same extent.
My sentiments exactly. In the wake of the Nolan inspired trend for darker, more serious movies, it seems that another contingent of fans has arisen that covets melodrama and soap opera theatrics above all else, and in a similar fashion to the "dark, gritty, angst = art" crowd. The quote in my sig fits in a broader sense in this respect.
I've noticed that when some folks tout (or tear down) a movie for emotional content, they typically seem to be referring to the cliched, common emotions you find in soap operas, i.e. varying degrees of overwrought grief and/or anger. These are the types of people who would say that a movie like Happy-Go-Lucky isn't emotional, when that movie, for as lighthearted and upbeat as it was, ran the whole gamut of emotions. Angst shouldn't be considered the only place from whence legitimate emotion comes from. I'll bring up TWS in this regard as well. This movie was remarkable for how deeply it delved into the full spectrum of emotions. Feelings such as confusion, self-doubt, fear, surprise, frustration, anxiety, sentimentality, and adoration are among what was explored in the movie, and by more than just the main players, for that matter.
I realize that the movie is generally held in very high regard, but the reason I bring up TWS is because I'm reminded of someone whose sole complaint was that the movie wasn't emotional enough. This person was, unsurprisingly, a particularly devout TASM fan, and after reflecting upon the wide range of emotion that was actually covered in the movie, all I could think to myself was "What kind of emotion was it lacking that could have benefited the movie as a whole?". If what TWS lacked was a protagonist who wallowed in self-pity over a relationship, then to that I'd say...it was for the better.
Now, I think that this is of particular importance to point out, because not only do some folks use a rather narrow, reductive definition of terms like 'emotion' and 'mature' when they describe a movie, but at times, it seems like they don't stop to consider how the inclusion of whatever emotion they're clamoring for would serve the story, themes, and characters. I don't like the idea that melodrama should be shoehorned into every genre movie just to placate certain fans or tick a certain box. Just as with tone, it needs to fit organically before it should ever be considered in the first place. There's no such thing as a free lunch, and the misuse of tone and melodrama is readily apparent in lackluster genre flicks like TASM, TIH, Dredd, MoS, and The Wolverine (IOW, reactionary remakes and sequels that emphasized trends rather than honest, effective storytelling and innovation). Speed, Bourne, T2, RotLA, or Die Hard never suffered due to a lack of emotion, although what's again important to point out is that those movies featured exactly the emotions that they needed in terms of plot and theme; they didn't ape what was trendy in order to mask their shortcomings. Melodrama and a serious tone seem to be en vogue these days, but in my opinion, for all the wrong reasons.
With all that being said, I don't agree with the idea that most of the Marvel movies have been devoid of emotional resonance. I don't see how people can take the internal conflict of Banner, the familial issues present in Thor, and the personal, traumatic struggles of Tony Stark and say that the movies lack emotion. Even then, those are some of the more commonly touched upon examples, while things like pride, joy, excitement, triumph, and satisfaction are ever-present in these movies (Apparently the uplifting stuff doesn't rate). What the issue seems to be is that the movies don't dwell on and/or emphasize the two or three traits that some folks tend to favor, which is fine by the way, but call a spade a spade. Don't say that a movie lacks emotion because it doesn't have a romantic, teen angst sub-plot, or that the protagonist isn't on an arduous, aimless journey to find his/her place in the world.