I drink diet drinks quite a bit...I find it's one of the few things in my diet I can have as much of as I want (0 calories!). I'll have 2 cans of Diet Coke or Diet Cream Soda a day. I still get plenty of water, too. I have never noticed it being a hindrance to weight loss, nor have I noticed an increase in sweets cravings. I hardly ever crave sweets. However, I don't really have a big sweet tooth to begin with, so it might be different for other people.
I'm no beauty queen, I'm just beautiful me