Love my slow cooker. I can only say if it comes out over cooked, then well it was overcooked! Just because it is a slow cooker doesn't mean it can't be overcooked just like any other method out there.
I don't prep anything before putting it in the pot, just put it all in and let it go. I do everything from Chicken, beef or pork roasts, stews, soups, bbq country style ribs, pork chops, etc in it.
I don't have any recipe books for slow cookers, I thought I had one around here somewhere but can't find it. I took some recipes from online and used them as suggestions or idea or bases for making my own recipes.
I use my family as my judges, and so far they leave no leftovers behind!!