Maybe one day, Albus Potter might rank higher on the list of the most powerful Hogwarts students, but at the moment, he is still young. As the son of Harry Potter and Ginny Weasley, Albus was sorted into the Slytherin House when he enrolled at Hogwarts, much to everyone's shock (especially his
brother James', who was was sorted into Gryffindor).
He spent his first three years at Hogwarts struggling at even the most basic spells and felt like he wasn't living up to his dad's legacy. As a result, his powers were nowhere near the level of his dad's, although he did have basic skills of casting charms.