He's a bad kisser

I'm taking things slow with this guy, but he's a really bad kisser and you know when you have a really hot kiss and you get into it heaps, well I just don't feel it at all. I've tried subtly helping him with how I kiss and I've even given him some verbal hints but it's not working!! I don't want to hurt his feelings, and is it possible he's just a bad kisser? Any suggestions how to approach this?