I remember an interview in Rolling Stone with Bob Dylan (this was around 2002 or so) in which he dismissed a lot of popular music and he talked about what separated his generation from the (then current) one was that his generation understood their roots and the music that came before them, and that knowledge allowed them to craft truly innovative music because only by understanding what came before can you rise above it. In his view, Dylan believed that most of the artists of the modern era were mimicking what they liked without understanding of the craft, and therefore it would only rise to the level of imitation.
I feel like many modern writers are guilty of that; old comics are a Wikipedia article rather than something they live and breath and read, and I feel like so many of them are, as you say, influenced by cinema overly so. They almost seem to be plotting to what would make a good movie or a good movie tie-in (though, to be fair I'm sure a lot of this is editorial control) rather than understanding what makes a good comics story. My biggest gripe is, as you say, comics have been somewhat serialized for awhile, but it used to be each issue told it's own story as well. I read so many single issues now that simply do not stand on their own as a single story; they are simply part of a larger arc. That bothers me because it shows a distinct lack of complexity in the story being told.