This review may contain spoilers. I can handle the truth.
If what happens at the very end of this film doesn't lead to the US electing the Red Skull as POTUS on a "Make America HYDRA Again" platform in a future MCU film, then they did it bad.
This is, I think, the only Marvel movie that gets richer the more you think about it. Upgraded my rating to 5 stars after a few days of thought, and placing this squarely at the top of my MCU ranking.