Slow Cooker Baked Ziti

I made this one last weekend. It is from www.recipezaar.com - I get most of my recipes there. :)

Ingredients:
1 lb ground beef
1 medium onion, chopped
2 teaspoons dried Italian seasoning
1/2 teaspoon salt
2 (25 ounce) jars pasta sauce
1 (15 ounce) container ricotta cheese
2 cups mozzarella cheese, divided
1 cup grated parmesan cheese
1 (16 ounce) box ziti pasta

1. Cook ground beef and onion in a large skillet over medium-high heat, stirring occasionally, until beef is no longer pink. Stir in seasonings to evenly coat meat; stir in pasta sauce. Set aside.
2. Mix 1 cup mozzarella, the ricotta and parmesan in a medium bowl. Spoon 2 cups of meat sauce into the slow cooker; top with 2 cups ziti. Drop half of the cheese mixture, by rounded tablespoons, over ziti; carefully spread over ziti using back of spoon. Layer with 2 cups meat sauce, the remaining ziti and remaining cheese. Add remaining meat sauce, completely covering all the ziti and cheese. Place lid on slow cooker.
3. Cook on low for 6 to 7 hours or high for 4 to 5 hours or until noodles are tender.
4. Carefully remove lid to allow steam to escape. Sprinkle food with the remaining 1 cup mozzarella; let stand 10 minutes until melted. Serve directly from slow cooker.

Comments
This wasn't bad, but it didn't excite me either. It was very dry. I ended up throwing it in the crockpot later than I'd meant to, so I cooked it on high. I don't know if that makes a difference or not. I think it might need more sauce or something - it was just ok.