You’re certainly right that their handling of nuclear was inefficient for reducing carbon output.
I’m pretty pro nuclear, but I don’t think that really takes away from their success in pushing renewables forward, they were a very early adopter of solar thanks to their very generous subsidies and probably helped fuel its growth at a faster rate, so regardless of their unfortunate paranoia around nuclear, they do deserve some praise. Perfect is the enemy of good, and given the speed the world has responded to climate change, Germanys mixed and painful transition was certainly not the worst.