I know it's not quite Bundesliga, but went to my first game in Germany last night - 3-2 Extra Time win for Dortmund vs Union Berlin in the Pokal. Great fun, wasn't quite a sellout (72,000+ I believe was the announced attendance) but atmosphere was still brilliant. Yellow Wall gets after it, and there was quite an impressive contingent of Berlin fans making a hell of a lot of noise as well. Very impressed with the beer carrying technology, made it an incredibly easy walk with my four pints up the terraces
Bit of a process to get the beers as all sales in stadium are with a specific Dortmund cash card, so I had to wangle one out of a bloke without him knowing too much english and me not knowing any German. Had to pay for it with cash, so luckily I had 20 euro on me to do so - got me 5 beers so it was worth it
Definitely recommend the trip if you're a lover of seeing footy in other places.