I was a DC fan and i had not heard anything about marvel superheroes apart from a few cartoons i had seen during my school days. But the Avenger saga which started with Iron man in 2008 really irked my interest. I came to love each new character that was introduced, after every movie i went back and did my own digging into comic books. So yeah Russo brothers, hats off to you for the way Marvel Universe was portrayed in the movies. And in this movie, boy you took it to the next level!!
Avengers Endgame is exactly how a superhero movie is supposed to be made, it touched all important details of the comics. Also, of all the time travel movies that i have seen, this is the only one that gets it right. At the end it was disappointing to see the journey of some fan favorite characters end, but i hope MCU keeps telling us stories about Marvel characters the way they have.
If you liked Avengers only because of Iron Man, Captain America....then you are not a Marvel fan, you are just a person who likes good movies. Avengers Endgame was made for the comic book nerds, not for you.