I've found that my tastes have changed over time (currently week 6).
I started adding only 250ml's of water with some of them, probably because it was sweeter that way and then gradually went up to 350ml's.
The biggest change has been with the soups though. I didn't like them at first and then after a week or so I had a hankering for something savoury so tried them again. Going from hating the thai chicken to loving it is strange.
Maybe all to do with variety and you decide that the taste is actually quite nice given that all you've been eating is vanilla shake for the last week or so!
My advice is if you don't like something at first, go back to it 1-2 weeks later and see if it tastes better then.