I am rather disappointed with Google Now. I recently took a flight, and it wasn't picked up at all, despite all the related emails in Gmail. I couldn't find a way to manually add a flight either.

The top card is always my employers stock quotes. I don't actually care how it moved during the day.

It shows the weather where I am, but I already had a home screen widget for that.

It shows directions to places I have been before, but I can never rely on a card to be there, so I rather open Maps directly.