I'm playing on a HP Pavilion dv6150sl (a 600€ laptop) everything maxed out with a 4x af 16x
If you buy a laptop with a 15,6" screen and a resolution of 1360x768 you don't have to spend an arm and a leg for a heavy, power hungry desktop replacement.
What you're saying is that as long as you buy a terrible screen, you don't have to spend as much to get good graphics. So: as long as you play at lower graphics, you don't have to spend more on good graphics.
You could max out everything at 1366x768 but it would still look awful on a 15" screen because of the terrible pixel density.