I'm a fan of older movies and tv shows. One thing that stands out to me in modern shows is the pacing. In older media, they had no problem having a bit of silence and slower parts, but newer directors typically see the need to fill every second with action or dialog. I doubt that we'll see another Lawrence of Arabia for example. I'm not sure if this is entirely on the studios either, as I expect that modern audiences have much shorter attention spans. This is actually something that I'm trying to work on myself, as I'm trying to wean myself off social media and get back to reading more.
To be clear, this trend of newer shows being catered to shorter attention spans goes back a few decades, so it's not an entirely new thing. I really noticed this when I recently watched Star Trek DS9. The pacing really stood out to me because they really filled up every second of the episode with dialog or action. For example, it really stood out to me that when two characters ended a discussion, a new character would immediately walk in and start talking immediately after the first conversation ended. Someday, I'd like to grab some transcripts from DS9 and TOS to see if the amount of dialog differs as much as I think it does.
Modern action scenes also stand out to me. I can't stand action scenes comprised of really short cuts, especially if they are zoomed in on a character. While they look flashy, I find that I can't see what is going on. To be fair, the action scenes were often a weak point from older movies as well. I love the old historical epics from the 60s, but the combat looks like untrained actors playing with cheap plastic swords.