I've made one quilt with a fleece blanket as both backing and batting. I simply quilted the top to the blanket. My son loves this quilt, and it does drape nicely and "snuggles" him. However, I don't brag about it because The Quilt Police will come and take me away.
Use whatever you like best and gives you the results you want. If someone tells you that you did it wrong, simply look at them and say "And?" to every statement they make. It should only take 2 or 3 "ands" for them to get the hint and shut up. :)