Look, diDi my friend, I have never hidden the fact that I don't like Bayern (hate is too strong and there is no reason for me to hate them) and I put them and Real Madrid on the same mantle. But that does not mean I can not be objective (or as objective as I can be since we are all subjective) when it comes to all things Bayern. I consider Bayern one of the best teams in the last several years and at this moment the best team in the world right now. I will never be as low as the likes of mavros, you know?
When it comes to individual players, there have been Bayern players that I like(d) and there have been those that I don't. Everybody knows I am a HUGE Bastian Schweinstieger fan, he is one of my all-time favorite players alongside many Barca players. I also like Van Bommel, Van Buyten, Javi Martinez, Badstuber, Neuer, Lewandowski (hates him when he scores for Bayern though) and Goetze (even though I hated him for a quite a while for ditching BVB for Bayern).
When it comes to Mueller again I have never hidden the fact that I don't like him. But at the same time, I have always rated him highly for his footballing abilities, such as his football IQ, his off-the-ball running and his ability to show up in the right place at the right time. I try not to let my preference (whether I like a player or not, how I feel about him) cloud my judgement/evaluation of a player.