I actually like the dutch chololate shake, it's the only one I can drink "undoctored."
But there are many things you can do to help with the shake flavors. For one, I always add 9-10 ounces instead of just 8. That should help with the "snot" texture.
The other thing is to prepare the shakes in a blender with ice. The colder they are the better they taste - I promise! You can also blend them with a diet soda instead of water. With the vanilla, that is PARTICULARLY tasty. Sometimes I also add cinnamon or a dash of nutmeg. You can add a few crystals of instant coffee, or even just mix the shake with cold coffee for a frapuccino treat! Some folks also like to add a little bit of crystal light, although that doesn't suit my taste as well. I've also heard that there are sugar-free syrups that you can add to the shakes, but I haven't tried them.
Since a blender isn't always available, I make sure to add ice when I drink the shake. Like I said, I can drink the dutch chocolate undoctored, so hopefully you will also find a flavor you prefer for those quick, on-the-go shakes during the day.
I hope this helps! Keep us informed - the program really works and I hope that you develop a "taste" for it!
Good luck!
Kimbob the Hopeful