All those buttons do have a function tho'. Activate/deactivate ESP, seat heaters, airscarf, parktronic, door locks, etc...
This car has a lot more functions then the old one ever did, it's called "progression". Nobody is forcing anyone to buy stuff they don't want, so if you don't like it, just let it drop.
Having said that, the picture shows a "souped up" SLK, i.e. one with all the options you would ever need or want.
If you don't want them, you can get the standard radio with 3 times less buttons, no heated seats, airscarf and so on, which removed half the buttons on the middle row, and swap the bottom portion which is the airconditioning, to the simple 4 dial setup.