When you are surprised by a piece of information you have just learned, is it OK to ask the question without changing the subject or verb order?
Example:
You really think Argentina has the best team in the world. But then you learn that it has scored fewer points than a few other teams, Brazil won more cups, etc. After learning the facts, would be OK to write / ask:
In response:
So, Argentina is not the best team in the world?
It is not a rhetorical question, and it doesn't really imply an answer. The facts are created from the above sentence.