Your crockpot is probably too big. A smaller pot is easier to fill at least 2/3 of the way, which you need for it to work properly.
I have a Crock-Pot 2.5 Quart manual slow cooker that I got in the grocery store for $10. I happily use it a couple of times a week. I have a larger, oval one that I use once a year at best (once the frozen chicken bones build up and need to be made into stock).
Recipe I make regularly that come out tasty:
Pulled Pork in the Crockpot
Pork butt or shoulder - rub with bbq seasoning or cumin, chilipowder and oregano
1/4 c soy sauce
1/4 c apple cider vinegar
Set crock pot on high, cook for 4 hrs.
After 4 hrs, drain fat and drop temperature. Add BBQ sauce.
At hr 6 you should be able to pull using 2 forks.
Serve on rolls.
Slow Cooker Chicken Tikka Masala
(cook low for 6 hr, or high for 3 hr) - serve over rice
1 to 1 1/2 pounds boneless, skinless chicken thighs
1 large onion, diced
3 cloves garlic, minced
1-inch piece whole ginger, peeled and grated
2 tablespoons tomato paste
1 to 2 tablespoons garam masala
2 teaspoons paprika
2 teaspoons kosher salt
1 (28-ounce) can diced tomatoes
Add at end: 3/4 cup heavy cream or coconut milk, fresh cilantro chopped
Italian sausage in marinara - cover sausage with water in crock and cook all day. Drain in afternoon, slice some green peppers to add, and cover in marinara sauce. Serve with pasta or french rolls.
Teriyaki Chicken
6 boneless, skinless chicken thighs
1/2 c teriyaki sauce
1/2 c water
1/2 c brown sugar
3 cloves garlic minced, or 1/2 tsp garlic powder
1 tsp minced ginger root, or 3/4 tsp ginger powder
Vegetarian Chili - made different each time depending on what is in the cupboard
any beans you've got (kidney, chickpeas, etc.)
some diced tomatoes
some chicken broth
chopped onion
chopped green pepper
garlic
chili powder/oregano/cumin/coriander
hot sauce
I have a small (3 cup) zojirushi rice cooker, too. Between it, the crockpot, and nuking some frozen veg, we get hot dinners within 5 minutes of being done with work. Priceless.