This is a classic and one of LeGuin's most celebrated books for a reason. Not only is it a fantastic science fiction book with one of the most meticulously thought out cultures I've read, full of folklore and traditions and sayings and other bits of flavor that make it feel like a living breathing place, but I couldn't imagine anyone better than LeGuin to write about the process of looking past your prejudices to move from ignorance to understanding and the messy process of accepting a culture different from yours that manages to be brutal and miserable but undeniably sweet and heartfelt at the same time. I loved The Dispossessed but I suspect once the dust settles it might be The Left Hand of Darkness the one to stand at the top of her scifi output for me.