If it's negative and hateful talk, then that may turn off your date. The same goes for complaining - if you bitch and moan about everything wrong that you can think of, whether it's the restaurant's service, the terrible movie and the food you ate, then you'll look like a major Debbie Downer. Learning to make the best out of a difficult situation, like not being able to get your waiter's attention, is an attractive quality. Finally, a willingness to commit is admirable - but not on the first date. Leave out your burning desire to get married as soon as possible, if that's the case. It's fine to express interest in seeing him or her again, but commitment-wise, that's as far as you should go on the first date, lest you scare away your date.