He did have kind of a slow start, but if anything he's an overacheiver compared to most of his alternate selves.
I will bow to your knowledge, but I will also be honest and say it sure as hell did not feel like he ever over achieved.
Fair enough he was younger, but he never seemed as smart as a Superman should be, and at times unwilling to use his powers, sometimes ashamed of them, and become the superhero he was meant to be.
Also I think Chloe and Ollie had as much to do with the Justice League as Clark.
Back on topic, there is also the All Red Rangers episode. Forever Red.