well given that before she was named vp candidate she didn't know what the vice president does, I can see how she's probably more familiar with what the president does vs. the vp.
If you question is if others are comfortable with her being President, heck no. She barely talks to the press. She only reads from her talking points notes that are provided by her campaign staff. She's not ready to be president and she needs to be if Mccain is elected since he would be the oldest first term president in history.