I lived/worked there for the past few years. Had a 45 mile commute each way, my wife had a 40 mile commute each way in the opposite direction. We've both found German drivers to be much worse than UK drivers. Driving here is downright civilized in comparison (London in the naughties, Scotland in the early 10's, and now Lancashire).
Germans hardly ever indicate, constantly tailgate, are chronic speeders and are clueless when it comes to roundabouts. Very aggressive drivers. A lot of them treat every motorway as if it's a no speed limit autobahn. Their insurance premiums tell the story. No way will you be able to get the equivalent of 240 pounds for a premium (my last premium before I moved to Germany). My Uncle who's been there for donkey years still pays 600EUR+ a year on a fiesta (perfect driving and claims record). My last premium was just under the 800EUR mark for a Diesel Honda Civic Hatch.
When it comes to speeding, the fines are a joke and used be as low as 10EUR with no points, now 20 EUR oooh (Link), so everyone is doing 10+kph.
Roundabouts ha. We had a horrible 4 way intersection in Bonn, constant traffic gridlock. They put in a huge roundabout, multiple accidents later they put back the traffic lights on top of the roundabout. They never indicate when they leave the roundabout, so good luck merging into a busy roundabout when you can't tell if the moron coming towards you is leaving at your exit or continuing round.
Unless there's a speed camera in a construction zone, no-one does the reduced limit. God forbid you do and it's a single lane construction.
Staying in the left lane (right lane here) till the last moment to jump in front of a line of cars exiting the motorway...I've got endless stories of German road stupidity. I really don't know where they get the reputation of being good drivers. Frankly I'd take the Yanks over the Germans when it comes to daily driving.
Sorry rant over