Obviously, if your chili is vegetarian, then beans are the source of protein. By all means, add beans, and don't be shy about using lots of different kinds - black, navy, kidney, pinto. For meat-based chilis, it could go either way depending on your preference.
I used to hate beans in general, so naturally, their appearance in chili would turn me off completely. These days, I recognize the importance of beans from a nutritional standpoint, so I am not offended when there are beans in a chili that someone else had made and served me. However, when I make my own chili, I normally leave the beans out.
Adding Beans to Chili:
If you are adding beans to Slow Cooker Chili, you have to swallow your pride and go the way of Sandra Lee. Use canned beans. I won't go into the details, but there is some chemical significance to using canned beans over dried ones that you cook yourself. To the beef, vegetables, and tomatoes in the crock pot, add 2 cans of beans (drained).
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