In my opinion, Jennifer is one of the most talented actresses. There is something that makes her special and outstanding from others. Maybe it's her smile or something inside her. The character of Sidney Bristow, which she created in Alias, is really great. She was able to show us the complex personality of Sidney, all her strong and weak points. She made us think that she really is Sidney.
Another roles of Jennifer Garner were also very good. I like them all. I think that an appearance of Jennifer guarantees us that the show is truly worth our time. Jennifer has become one of my favorite actresses since I saw the first episode of Alias and she will be on my list forever!