Kale is great!
I've eaten at Kale a bunch of times and I've never had something that I didn't enjoy. I'm particularly fond of the leek pie, the pierogies, the hummus, the marinated tofu, and the many salads. Their baked goods are also really nice (and less heavy than traditional baked goods). And it's awesome that they change up their offerings all of the time. It's fun to walk in and find a bunch of new stuff to try.
Purely in terms of taste, variety and healthfulness, Kale is one of the best places in the city. (And, even more important than that, it's a 100% vegan place!)
The one obvious problem with Kale is that the prices are way, way too high. For a counter-service place that's cooking primarily from simple ingredients, there's really no justification for the price.