At two points in Captain America: Civil War there's some unconvincing CGI. One is a rubber character model falling like a ragdoll and the other is some iffy greenscreen during a key scene. And that's it. That is literally the biggest criticism I can muster about Marvel's magnum opus.
To call Cap 3 the best film in the Marvel Cinematic Universe is to sell it short. It is borderline perfect, a thrilling, character-driven blockbuster that stands above the rest of the superhero genre, from classics like Superman: The Movie through genre stalwarts like Spider-Man 2, and even out-thrills The Avengers; it is second (or rather fourth) only to Christopher Nolan's The Dark Knight Trilogy (and actually better if you view it from a purely comic book metric).
After the mid-rangeMCU outings last year, and 2016 so far offering up the entertaining-but-formulaic Deadpool and the frankly disastrous film-that-shall-not-be-named, I was almost tempted to write off superheroes as something so financially important it had become artistically cumbersome. Instead, Civil War has exceeded all expectations and pushed the whole genre forward. Let's look at the ten biggest reasons why it's such a success.
This review is SPOILER-FREE, but does discuss some broad plot elements.