Don't base your decision on one visit. That would be like someone saying you were a terrible mom based on your child's one temper tantrum in Target.
Ask if there are any opportunities to tour the school. Our district has kindergarten tours every spring. Contact the Parent group at the school and ask if you can talk with current parents.
Also, don't base your decision solely on some website that rates schools. I teach in one of the highest rated schools in our district. Our kids go to one of the lower rated schools in our district. There is no way I would move my kids to the school I teach at. There are several reasons.
1) The parents at my school are so cliquey. They advertise their meetings as "where the cool kids hang." No thanks. I'm not in Jr. High anymore. The PTSA at my kids' school is much more inclusive feeling. Even to the point of providing child care for their evening meetings. At my school, all the meetings are held during the day. No way you can attend if you are a working parent.
2) My kids attend a Title 1 school. To be a Title 1 school, there has to be a certain percentage of students receiving free and reduced priced lunches. Title 1 schools tend to get a bad name because that's where "the poor kids" go. And there is a stereotype that poor parents can't or won't help their kids. But, contrary to what Gamma said, free/reduced lunch does not mean uneducated parents and dirt poor. If I had been a single mom when I taught in South Dakota, my kids would have been on free and reduced lunch. A single parent, with one child, who makes $29,471 a year would qualify for reduced priced lunches. That's the federal guideline from the USDA website. It is actually to the advantage of the school and students. Those schools receive more federal money and can implement more programs. My kids, who excel at school, get programming that the excelling kids in my school don't get. Why? Their school can use their Title 1 funds to provide resources for their struggling students. Their normal funding can then be used for other programs. In my building, a high percentage of our total funding goes to resources for our struggling students. Our excelling students don't get much extra. And even our struggling students get short changed. I'm a reading specialist, but only 1/2 time. Our test scores overall are high, so the decision makers at the district level don't think we need more than 1/2 time to service our lowest readers. Teachers in my building are often complaining about how we don't get the same resources that the Title I buildings get. I also see the teachers at my kids' school being more open to trying whatever they need to do to reach their students. In my building, there are teachers who get a difficult student and they are automatically trying to hand them off to a specialist teacher. (I'm not saying that all Title 1 schools are good. I've seen some bad ones. But, don't judge a school simply because it is Title 1.)
3) Yes, sometimes I walk into my kids' school on my day off and hear a screaming student. But, their school is the Autism Center in our district. Sometimes one of the students in that program is having a difficult day. And my kids are the better for being in with those students. My kids have learned tolerance and compassion and understanding in a way I probably couldn't have taught them on my own. And the administrators and teachers are incredibly amazing with the diversity within the classroom.
All that to say, don't discount one school based on a single visit or what a website says. Try to talk with people who have kids in the school. They will give you a much more complete picture.