I never really had problems with Biagi when I heard her talk, or explain her goals for CDOT, but it was abundantly clear that her department wasn't doing enough to prioritize transit modes other than the car. That's a failure, no matter how you slice it -- either Biagi was less than transparent about her goals/motives regarding pedestrian safety, she fundamentally misunderstood the problems that arise from car-centric design or she was unable to affect significant systemic change in her department.
Here's hoping whoever replaces her is willing to acknowledge de-prioritizing the car-centric transportation model as their #1 priority, and has a clear plan on how to move the city in that direction.