What do soybeans taste like?
I can get soy beans in two varieties here: As dried beans and as edamame.

Edamame is a particular type of soybean that is harvested when it is still young. The pods are cooked (usually boiled or steamed) and then served with salt. The beans are popped from the pod and eaten. The pod is discarded.

Edamame is sweet and a little grassy because it is young.

Dried soy beans can be cooked like any other bean. Their hulls tend to come free and have an unpleasant texture so it is nice to skim most of them off. The flavor is good but not unique. It tastes like a normal white bean. The raw beans have a very strong "beany" flavor but cooked beans should not.

Soymilk is made from dried soybeans. The beans or the milk are cooked to remove the very strong beany flavor. The finished milk does have a hint of sweetness and bean but not strong at all.

Tofu, made from soymilk, tastes the same as the milk. Besides being sweet and a little beany, it can be a little nutty tasting. It can get chalky if it isn't fresh.

All of these soybean preparations are very bland. They tastes fresh and clean but there shouldn't be any overly strong flavors. Strong flavors in these products are often a sign that the product is past its prime.

Some soybean preparations ferment the beans. These have a wide range of flavors and textures.