Kale is quite more fibrous, it's better cut in strips and blanched in salted water, then it gets softer. I quite like the taste, it's a great winter vegetable, mixed with diced potatoes and carrots for example
Kinnnda, but if you treat it like lettuce you'll be disappointed. It's a lot chewier. Think of it as in between lettuce and cabbage. Unless you're just bunging it in a soup you probably have to do a little more work on it.
I like to "massage" when eating eating raw. That's where you strip the leaves off the stalks and vigorously kneed and scrunch those up with your hands until they're soft to the touch.
Then you can throw in whatever dressing you like. Toasted sunflower seeds and dried cranberries are good at this stage, to really emphasise the toothiness of kale.
It's also kinda like spinach come to think of it. A lot of the same tricks work on it.
We were out of spinach (admittedly, I hate lettuce so I usually use spinach, instead) so I subbed in kale for my lunch sandwich, one time. I thought it worked alright, though.