I am sorry you've had only negative experiences. Most of mine with PMs were as well, but a good one is a dragon slayer and bottleneck unclogger. They feel like not like your manager, but like your servant, listening to exactly what you need, relaying messages accurately from other teams of what they need from you, and with the big picture perspective required for you not just to fulfill the task, but do it in a long-term strategically productive way.