I think those that are commenting that it should have a manual/it's a wank mobile are completely missing the point of the vehicle.
Its a Luxury car! You are meant to have comfortable leather seats, high tech everything, super build quality. A manual simply does not work for this sort of vehicle.
Sure you could hoon down the autobahn in your 250kw WRX at 260kph but you are going to be damn busy doing it while the Merc driver is casually adjusting his seat heater.
The driving style is also completely different, the AMG has enough torque to pull the sun closer, you don't have to work it at all to get where you are going swiftly.
Ubercruiser, and wicked.
If you wanted something more involving I would perhaps head towards the Audi RS range or BMW M range.