NB: this article considers only the four starting XCOM classes. We'll examine how each class functions, what their best and worst abilities are, who looks down on who, the works. So we've taken a more detailed look at XCOM 2's class system, and ranked them in order of their importance in the field.
Classes that were enormously powerful in Enemy Unknown now only function well with appropriate support, while others that were tactically difficult to use are now a vital component of any team of alien hunters. It remixes the abilities of the original classes, while also adding new skills that radically change how these soldiers are best used. Rather than simply adding further classes to the established roster, XCOM 2 performs an intricate restructuring of Enemy Unknown's archetypes.
XCOM 2's soldier classes are one of the best examples of how Firaxis have carefully overhauled the systems introduced in Enemy Unknown.