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?
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:
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.