Albany does see the evil in the actions of Cornwall and the sisters Goneril and Regan but chooses to remain with them, leading his armies to battle against the King of France. He also fails to approach attack Edmund or even approach his wife about her affair. In this way he can appear to be weak.
At the end of the play Albany survives and his speeches do suggest his goodness and therefore he could offer hope at the end of all the tragedy. However, the fact he has not always acted with strength means the audience may feel less confident about the future.