The X-Men films have the property you want, with plots and characterization included in the movie instead of relying on you to bring them with you in your mind.
(Are the later films good? They're not great, but if you watch one you'll come out with a sense that the movie had a plot, the things that happened were related to that plot, and the characters had reasons for the things they were doing. The films are quite inconsistent with each other, but they're very coherent considered individually.)
The MCU films of phase 2 have already lost it. (For context, phase 2 starts with Iron Man 3 and is mostly garbage with the exception of Winter Soldier, concluding with Ant-Man.)
My conclusion is basically just that someone at the MCU decided "we can save on the budget if we stop using writers".