I like all of it except Diet Pepsi for some reason (Pepsi Max is maybe my favorite), and even then sometimes I like Diet Pepsi. Occasionally I'll get one that tastes quite bitter, yet another time it will taste like a Pepsi.

This doesn't happen to me with any other diet drinks, not sure why this one isn't "consistent"- I guess maybe because Diet Pepsi I have more often from fountains instead of containers, since it's usually a backup when a restaurant has no other diet options