I personally don't see that Donna is that "awesome." She's not an awesome actor and she's not an awesome character (only a lackluster character perceived as awesome by other characters within the story).
And they overdo the whole Louis thing- in the beginning he was great, believable- human. A good lawyer, with a strong side of self esteem issues. Now each time they add some other idiotic quirk or the way he is easily manipulated by kind words from other partners just make him more and more unrealistic.