Agree that Germany is good driving, have been there quite a few times, but also found many sections of Autobahn have speed limits. One experience that was a little crazy was my German buddy driving our families in a VW wagon (I think a Multivan?) over 100mph.
Seen the VW musuem & HQ in Wolfsburg, impressive, and the BMW one in Munich, thought that was a long while back.
The best part of the driving for me, however, is not the Autobahn itself, I really enjoy the twisty, mountain roads in the south a lot more, for example near the Austrian border. Have driven back and forth a few times, including the approach to Neuschwanstein from Austria - that is fun and really scenic too! The rental cars I had were mostly VWs, like a manual Passat and a Golf TDI, both fun. I guess its personal choice, but I find twisty roads a lot more fun than straight roads and top speed.
And talking of fancy cars, seems Abu Dhabi is one of the best places. Its routine to see 911 Turbos and R8s and Nissan GTRs. Driving around the city will also catch frequent glimpses of Aston Martins, Ferraris, Lambos and SLRs. However the really unique ones I've managed to spot on the road here have been a Porsche Carrera GT, a Veyron, an Enzo and a Mclaren F1!!!