If a guy tells you that you are fun to kiss, is that good? He cant explain why I make kissing different to him either when i ask?

I guess you can say that that's a good thing. It depends on who the guy is too. If he's some sort of player or scumbag, I wouldn't take that too gratefully and I would be careful if I were you. But if he's the type of person who would probably mean that, then yes, it would be a good thing.