Whether or not baby formula is considered "tasty" is subjective and varies depending on the type of formula.
While adults may not find it palatable, its purpose is to provide essential nutrients, not cater to sophisticated taste buds. Milk-based formulas are often described as having low levels of sweetness and a "sour and cereal-type" flavor. Soy-based formulas are often described as tasting sweeter, more sour and bitter and having a relatively strong "hay/beany" odor.