Arguably the average Hollywood productions aren't culturally stellar either, but I digress. To me what did it was having a kid in the kindergarten/school and everything related to that. You get to participate to all kinds of social setups (you could avoid them but what's the point), you get to watch German movies with them, German TV to chat about, you get into the daily lives of your co-citizens. Don't worry, they don't do much Goethe either, if that scares you. Just normal people doing normal stuff, maybe joining some (team) sports club and and and. It just works naturally.