I suspected it would be bad - but not THAT bad.
Unfortunately, what I've noticed is that most buyers are quite happy to accept mediocrity. And if somebody dare say, "that tastes awful", the retort is that its a protein shake - its not supposed to taste great. I disagree.
I recently had the misfortune to buy TPW Chocolate Silk and it was one of the worst tasting drinks I've had in the last few years. But that in itself wasnt the problem. The problem was that no matter what I added to it, I simply could not improve the taste/texture. Truly the worst chocolate flavour shake I've had. And people on this forum rave about this sorry excuse for a protein shake.
Given that you prefer a "natural" taste, you should've got unflavoured whey. I did advise you of this, but you did not heed my advice. You couldve saved money AND got a better product.
If you want something that tastes great, do the following:
unflavoured whey concentrate (not isolate) (2 scoops)
MP toffee liquid flavouring (1 squirt)
approx quarter teaspoon of cocoa powder
half teaspoon of sweetener (I use Stevia, but any will do)
mix with water
This tastes very natural and you shouldn't gag. I'd say that this is the best flavour I've had in recent years and should beat anything that Reflex sell, while saving you money.
With your existing protein shake, to improve things, I would suggest experimenting with:
peanut butter
cocoa powder (this will give the shake a stronger chocolate flavour)
try it with milk (this will create a thicker texture, and richer flavour)
try it with water (this will thin the shake).
I hope you can create a recipe which makes it more palatable.