Some great advice in the @plantstoplanks. A lot of people tend to go for very sweet all-fruit like orange, banana, mango, etc but balanced with greens, seeds, veggies, whatever, makes them suuuuuuper nutritious and scrumptious too once you've played around with flavours. That's a good point you made about expecting sweet and getting earthy, but I think if people experiment and find a good balance of things they like, then you never look back!