I always hesitate calling *any* shard positive, especially after what we've seen.
All shards seem to me to be fundamentally broken and negative on their own, just in orders of degrees.
To be clear, Odium seems the worst, and Ruin the most destructive, but in this book alone we have good indications that Cultivation and Honor are both harmful as well.
The Shattering seems to be the biggest mistake in the universe, and I look foward to seeing why the 17 thought it was a good idea...