Although I don't personally know her I can only base my opinion on a few things. She's a beautiful and talented versatile actress/director.
She also appears to be serious about motherhood and has a interest in making the world a better place for the less fortunate. She has over 10 years of experience as a Goodwill Ambassador.
Some of my favorite movies with her are "Bone Collector", "Salt", "Laura Craft: Tomb Raider", "Mr. & Mrs. Smith", "Taking Lives"
She's won an Oscar, Critics Choice Award, & Screen Actors Guild Award. In addition she has shown her versatility in acting in such children's movies and doing voice over work in "Maleficent" which grossed over $700 Million worldwide, the "Kung Fu Panda" movies.
Angelina also has directed 3 movies (By the Sea, Unbroken, In the Land of Blood and Honey). Unbroken earned $161,459,297 worldwide.
Lastly a lot of women admire her for sharing her personal experience with regard to breast cancer prevention by having elective double mastectomy. All in all she seems to be very grounded.