I haven't seen Navi Rawat a lot, just in The O.C. and Numb3rs. I didn't see her in 24 even though she was in it - which I guess a crappy review for her as I do watch each and every ep of the show as it is one of my favorites.
Anyways. Navi Rawat has a certain cool over her. She seems to be a person in control of herself fully, atleast when she's on screen, and this gives her character a powerful feel.
So far I've seen her play very many parts, but am looking forward to do so. The fact that people think she is hot seems to be the core of the posts I've read so far, and yes she is. But combined with the cool I talked about earlier might give her an edge? The future will tell.