I think you will find that most rec classes with 3 year olds are this way. My child too was a good listener, and it drove both her and I crazy watching the bedlam in the rec classes. She was never so happy when she made preteam and only had girls (sorry boys) to deal with, and even then, there were a few who punked around. But the focus and effort percentages definitely improve as they get older if they are continuing to go down the competitive path.I get where you're coming from. My daughter is also 3 and has just started rec and when I watch the classes, I notice a whole lot of waiting around for turns and that this takes longer because the other kids are doing things like rolling around on the floor while my daughter is sitting nicely and listening. And she's heard the term "good listener" in preschool, so I always get a full rundown of who wasn't a good listener. lol.
I'm not, like, worried that my daughter isn't getting enough conditioning, but it's also hard to see her not really have a ton of fun because of all the waiting.
On the other hand, the timing of the classes for this age group are really convenient with big brother's gym schedule, so I'm reluctant to look for alternatives. I don't know if I want to add an extra trip to the gym just for her rec class when we're already there three times a week. So I'm still trying to work that out...