Kadilen was one of the first 5* I got, well over a year ago. I always thought she was somewhat underwhelming and underpowered compared to many of her 5* cousins, and that seemed to be the consensus on the forums too. However I have been using her more and more lately. Her special can really save your bacon, sometimes multiple times in one raid. Being fast she charges quickly, she has pretty high defense, and she can help keep the team alive until you can charge up a defense down hero (e.g. Isarnia), after which her ability suddenly hits a lot harder.
I post this just to encourage everyone to experiment with their whole roster, and don’t be too quick to dismiss a certain hero because of the general consensus. Almost everyone has their place in the right team (except you Margaret, you still suck).
Oh and Happy New Year everyone.