I don't think you have to be immersed...people should have been able to follow, as there were ample flashbacks/explanations. But this is like the comics... you don't have to buy every tie-in, but it helps....and other comics get referenced in many other issues.
But Marvel/Disney structured the MCU to be so joined at the hip that a new viewer could not drop in anywhere and understand anything. For example, there's no way fresh eyes could come into the MCU with
Captain America: Civil War and understand it with the many plot set-ups and direct references to other films, such as:
- Ross naming all of the Avengers' previous disasters, which would inspire a "er--they did what...when? How did that happen, and why?" to a newbie.
- The tense relationship between Rogers and Stark
- Why Rogers was trying to save some guy named Bucky (and you'd get the same reaction).
- Moreover, Ross asking if anyone knew the location of Banner and Thor, which would draw a blank for a new viewer (who we can assume is not eyebrow deep in Marvel characters / lore) and without watching the older films to know not only who they are, or why Ross is considering them part of the establishment of the Accords.
That's the issue with the MCU; its a series so laden with references / plot threads crossing into other films & TV / Easter Eggs, that few of its entries could play out as an independent story for a newbie to just start independent of needing to watch the other productions. IOW, the opposite of one book has a natural beginning and end. Start another.
You added:
But this is like the comics... you don't have to buy every tie-in, but it helps....and other comics get referenced in many other issues.
I disagree; Since the Silver Age, the "Big Two" (DC & Marvel, obviously) sped up the world building / continuity to the point that certain stories would begin in one title, and end in another; Marvel ramped up this practice with their events such as the
Avengers / Defenders crossover in the early 70s (among many of that kind with most of the publisher's A through C-list characters),
Doctor Strange / The Tomb of Dracula later that decade, and by the 80s, with event comics such as
Secret Wars, the plot / event--or effect
from the event was tightly interwoven in numerous titles, so there was no way one could simply read another title, see direct plots and/or references from
Secret Wars and understand how that impacted Random Superhero without having read the maxi-series. The MCU operates in the same manner, hence the increasing criticism of this franchise model (referred to in the
Variety article, and discussed here).