No, John Adams was not the best founding father, because, although he had many good ideas, there were others that have had more lasting influence. Thomas Jefferson was stronger, and more able to articulate his beliefs with many good writings that are lasted and studied. Ben Franklin was another. He was very clever and his writing is more sustainable than John Adam's work.
John Adams did many wonderful things for our country, but he is by no means the most outstanding or essential of the nation's founding fathers. It's hard to single out any one person who had the most influence in the birth of the American nation, however. Many people played an important role in this process.