I think he has actually played well defensively the past couple months. Of course, the improvement coincided with Samuel Ricketts' return and Paul Robinson's departure. And I am in the majority, as Martin Petrov has already claimed the club's official Player of the Year Award.
Petrov is known best for rampaging runs down the left side leading to great crosses, as well as cutting inside and shooting from the right side. He is also very good from dead ball situations, a talent that has been severely lacking for large parts of this season.
Whether we stay up or not, Petrov has been a large part of what has gone right for Bolton Wanderers in 2011-2012. Admittedly, that is a short list, but he is right at the top of it.