I would say lack of experience makes for a bad therapist, both therapy experience and life experience. For me along with being competent good therapists usually have decades of experience, they have strong ethics, they love their jobs, they spend time continuing to read and study in their field well beyond college and beyond any continuing education requirement, they take their own mental health as a #1 priority and are stable in their own lives, they are not driven by money but more by helping people.