BTW Just like to add that MVB was loved by the bavarians in his first year, so much so that they voted him their best player. So that pretty much kills Wardo's theory.
His first season in munich was horrible for munich overall, and vB was one of a few with an okayish performance. And he took over the lead of a headless team after the departure of Ballack.
The following seasons, munich fans noticed his technical flaws, which made him look pretty crappy occasionally, esp. in comparison to the likes of Ribery, Ze Roberto (who both joined the team then) and even Schweinsteiger. His other prob was, that he had to play as a true DM instead of CM which is his natural position, where he would be allowed to his strengths like rushing the ball through the field and taking (long)shots. And in this position another big challenge was his either lethargic or slow teammates lacking defensive work, esp. from the megadivas Ribery and Toni. Thus he put himself into a lot of 1-1s trying the win back the ball just 10-20m ahead of the own box. And then fouls and bookings are no coincidence.
Thats why munich fans arent really fond of him. But his image by the bundesliga fans in general is even worse: due to his bookings and aggressive playing style (reasons read above) he is fairly surely the most hated player in the bundesliga among all fans.