I finished the series a few days ago and I have to say, it was fantastic. It really mirrored my perception of the German experience. Being a German production, I expected it to be just another slew of Nazi apologia, but I was also pleasantly surprised. Apart from a few minor anachronisms and the somewhat annoying repeated chance encounters, I have no major criticism to offer. I watched it in German, without subtitles. Luckily my German is good enough for me to follow along.
"Wir waren fuenf, fuenf Freunde..."