I don't read All New Captain America, but that has nothing to do with the race of the character. It has to do with the fact that Sam's been written as an unlikable ass, and the story itself isn't very coherent. I just don't enjoy it.
"So while I am not compelled to continue buying "All-New Captain America" based on the strength of the story, I am compelled to remain a regular purchaser because of all of this."
This is literally the most wrong reason to support a title, mister Illidge. How are they supposed to know they're doing something wrong with the story if you keep purchasing it and, to the important folks at Marvel, are 'enjoying it?' It's simple. They won't, because you decided to purchase it anyway.