Does Audi make good cars? over hyped? problems? good on gas?

I saw the new A4 on my way home the other day and fell in love with it!! <3 But.. ahem... my brother told me not to buy an Audi because they are horrible cars. He said the engines don't last more than 50 thousand km and have a bleek record for quality and are over hyped by the media and since he is a car expert I'm going to believe him but I need a second opinion from other car people. Just don't tell him!