He can't kiss..

I've been talking to this guy for a little while now. We've kissed a couple of times. I know he's had plenty of practicing, because he's had 2-3 lengthy relationships. He's such a nice guy, truthfully, and there's so many great things about him... but he isn't a good kisser.

I've tried a couple of different things, but none of them I really enjoyed.

I feel terrible because I know that he's a great guy, but it completely turns me off.

Is there anything I can do?