( CNN) The chairmen and summits — whether with Russian leaders or European friends — have an uneven history. In the case of President Donald Trump, reviews of his performance at the G20 remain consistently mixed: Trump critics detested his performance, while Trump fans loved it.

As a fan, I would give Trump an 11 out of 10. He did exactly what the people who voted for him wanted him to do. He never hesitated from putting America first — or, in campaign vernacular, constructing America great again — whether the subject was climate change, trade or North Korea.

But history shows us no session goes perfectly — and sometimes it can be difficult to gauge the success of a meeting until years later.