My friends that owned Mac Laptops have had: Screens day on both of theirs, One the new Macbook pro and his older one, we had 3 servers that power supplies cremated themselves after just a power outage, 1 Video card go out, 2 Laptop Main boards go out, 1 server we had to replace the video card in. Thats for 4 people and a total of 10 machines between them.
My personal experience leads me to believe that they are just as reliable as a normal computer and worse for the laptops. I just seem to be a magnet for the special case with Macs it seems.