So far, these flavors have stood out:
GWAR Bloodbath: It tastes like fruit punch. Seriously, it tastes incredibly like fruit punch. It is the most accurate flavor I know of.
Hug Juice: Tastes like a mix of watermellon and berries. Really great tasting. This is my favorite flavor, bar none.
Cerealicious: It's the taste of Fruity Pebbles cereal.
Unicorn Milk: This is my least favorite of the four here, and also the most expensive. The flavor is a pretty accurate coconut type of flavor to me. It doesn't taste like a strawberry shake to me as it advertises.
So far, these are the flavors that have stood out. They are the only ones that, after tasting them, I go "Yup, that's the flavor it says it is." Plenty of other flavors I find to be lackluster in getting the flavor through, but not these.