It must be quite exciting to have so much variability in your domestic league. It's not one I follow closely, but it always seems to have dramatically over/under performing teams. On the flip side, I wouldn't want Arsenal to be fighting against relegation.
Hertha, Stuttgart, Wolfsburg, Dortmund and Leverkusen all seem very unpredictable.
The only German team I've seen play are Hertha. I saw a game at the Olympiastadion at the start of its renovation: good game, too.