A mom would be best equipped to make what her child would think is the best meatloaf in the world. A mom would know what ingredients and consistencies make meatloaf taste the best for her children. There is no standard of measurement for tasting the best in the world.
There are a number of recipes that are named "Mom's Meatloaf" or "Mom's Best Meatloaf," in an effort to be more enticing. The leading websites for recipes, including Food.com, Allrecipes.com and FoodNetwork.com all contain recipes for meatloaf that are either compared to Mom's or literally are by the writer's mother. Though it is impossible to definitively state that all Moms make the best meatloaf in the world, there is a general consensus that if a person likes meatloaf, then they think that their mom's is the best.