Yes, you have to avoid lean cuts of meat, such as pork tenderloin. It works fine for pork or beef roast, though.
My favorite slow-cooker recipe is "Ultimate Crock-Pot Oatmeal" from mrbreakfast.com. I heavily doctor it with extra apple and dried fruit and use steel-cut oats (they don't turn to mush as easily). Definitely worth a try.
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