It's all in what you like. We have a 3 year old...so the loud behavior was just fine as we weren't embarassed. She was also amused and if she's happy....we're happy. Yes they do the "antics" at all meals. It's all in your server. Some are more reserved than others. With that being said, we like it because they offer a good selection and it adds a different type of meal to your vacation. How often do you get a server who jokes around with you, plays jokes on you, and makes things fun?
I've found people on the DIS either love it or can't stand it. So keep that in mind when scheduling your meals.