A guy at work was a fan of Bayern Munich so I started following them which pretty much led me to enjoy watching the German national team. That and Ballack's play in the Euro a number of years ago.
Recently I have been watching more EPL, mainly when ManU and Arsenal are on. One thing I have noticed is the top heavy nature of the big euro leagues. The EPL is in flux somewhat this year because ManU is down but the reality is there are a few teams that contend for the 4 champions league slots and that is in. In the Bundesliga is pretty much Bayern and Dortmund. I can't really speak for the other big leagues, but in Spain you hear of Barca and Real and in Italy it had been Juventas for years.