Okay, i my humble opinion, the words that your Dom uses for you are only as good as your reaction to them. I personally love it when i've done something to please him and he tells me that i'm such a good girl. However, if hearing this does nothing for you then you should be open with your Dom and tell him that. If you are having a negative reaction to his words of praise then it is also bringing you out of sub space when he uses them, it takes away from your pleasure and no Dom worthy of having the title would want something like that for you. It would be a simple matter for him to find the right word that just makes you feel all warm and happy when you hear it. Communication is the key here, he is trusting you to tell him when something isn't right. Good luck.