Well ... if I'm kissing something and if there's no chemistry, if i doesn't do anything for me, then yes - it's a dealbreaker. You want chemistry, otherwise where's the attraction and connection? It's not entirely about the emotional/mental connection, physical plays a big part too in whether I want to be with someone.

I'm sure there's something about a big wet sloppy kiss that makes you think someone has shoved a salivary wet sponge in your face.  Or one of those where someone tries to do the salsa with their tongue and your esophagus, which just makes you wonder if they're trying to fish for leftover food that's on the highway to your stomach.

It may be a preference thing, but I'm of the opinion that it is generally a dealbreaker.  Something's bound not to work out when every time he/she swoops in for the kiss you have negative thoughts that start with "Oh boy...*face palm*" and ends with "Ew...*face palm again*."

Yes. A few times in my past I've kissed a guy and knew right then and there things would never work. I just assume that if you're a bad kisser, you're probably bad in bed...and I don't have the patience to teach EVERYTHING.