"What have you heard about our company that you didn't like?"This is an unusual question but just in case you will need an answer. After researching and you find out that everything is good, you can basically say that you couldn't find anything wrong. Try to mix in humor if you can since this is an odd question. Also, take a moment to pretend to be thinking about the question before answering immediately.
"From my research, I didn't find anything I disliked. This company provides great benefits, works on exciting products, and is listed in the top 100 companies to work for.""When I search for a job, I always look for negative things. However, I didn't find anything that I didn't like. That's why I'm very excited to have this opportunity to work here.""Hmmm... I read up on this company thoroughly and even spoke with a friend who works here. I didn't hear anything negative about ABC Company. Is there something I should know before working here?"The last sentence in the answer is a question you should say with a slight smile. That should lighten the tension a little and show that you are fully confident.