Almond milk: Good in coffee, can get decent microfoam for lattes & such. Unsweetened vanilla is nice in smoothies or coffee with a couple drops of liquid stevia. Pretty watery, though.
Cashew milk: Watery, like essence of cashew. The kind I buy literally blends in almond butter to thicken it a bit. Tastes pretty bland. Doesn't foam.
Coconut milk: This is not a beverage. The coconut beverage they sell as "milk" is a chemistry project.