Whereas a good actor dissolves into, immerses themselves and effortlessly inhabits a role, and a really good actor is when you forget that an actor is actually playing this part and you simply accept that the role is real, and hardly notice the player who interprets it for you.
Those are the elite ones. My choices would be people like Russel Crowe, Al Pacino, a young Robert Dinero, Meryl Streep, and Johnny Dep although his last movie, Dark Shadows was a bomb.
Elite actors rarely appear at the top of the box office numbers. If you want to look at something disillusioning, look at this list of top movie actors by box office gross, to see Daniel Radcliff at the No.1 position. In fact look at the top 10. A good illustration imo of how an actor can be carried by a film franchise without particularly special acting skills.