I've made this a couple times so far, and it is really good. I love all the flavors, and I especially love how easy it is. Slow cookers are the best! I usually mix all the ingredients in the slow cooker and refrigerate overnight - or longer - and then start it cooking the next day or whenever needed. It's great for potlucks or taking food to share. It would also make a great weeknight meal.
The original recipe called for less liquid and none of the veggies. I just had to add some corn because it goes so well with chicken and black beans. And then I had a pepper I needed to use and some onions and cilantro, and I just had to add those too. And cilantro goes with all of it! It looks really pretty too. This is before I added the broth and salsa:
If you want to keep it really simple (not that this isn't simple) you can skip any or all of the added veggies and just use the chicken, barley, black beans, broth, salsa and seasonings. Either way it will be good. The seasonings are great. I will definitely be making this again - in one way or another. (It depends on what I have in the house, but don't all recipes?)