It's a very BIG move. More action, more CGI, more characters, more loud noises. If you understand it, you'll like it. But to understand it, you have to have watched at least most of the movies that preceded it, that introduced all the characters, so you'd know how they work and what 'magical powers' they have. Most of the characters are not introduced and 'developed'--the film just assumes we already know them.
If you like this kind of movie, AND if you've seen maybe 10 of the 20 Marvel comic movies so far, so you have an inkling of what's going on, what all the fighting is about, you'd love Endgame. Otherwise it's "a tale told by an idiot, full of sound and fury but signifying nothing."