Falcon and the Winter Soldier - Trailer

Saint by the Bay said

All of the other serums were an attempt to recreate the serum Steve took. They aren’t as perfect as the original formula.

Also, Steve trained like crazy in addition to what the serum did. He wasn’t just a product of the serum. I don’t think the Flag Smashers really worked at continuing to work on their bodies.

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Yeah, remember, those flag smashers weren't exactly trained fighters.

It's why bucky, when he'd let himself go, and Walker could eventually beat then down. They're just far better trained.

If you remember, bullets still stopped Steve. He was just lucky Bucky grazed him and shot him in the torso away from anything vital (assumed).

But yeah, in Endgame, Cap was willing to go down fighting by himself. "I can do this all day"

And not only was his shield cut in half, he had a massive slash along his forearm. Shocked he didn't bleed out.