We've been going to Camp Smile (I'm assuming the dentist you are referring to) for 4 years and have not had anything but absolutely wonderful experiences. My son has special needs and last time he absolutely would not cooperate - I think he might has actually bite Dr. Dan. They were wonderful and understanding.
This just goes to show you that everyone (even businesses, and, I presume - you) can have a bad day or make mistakes, whatever. This is why I always take consumer product ratings with a grain of salt. For every one person who has an issue, there may be hundreds or more who have good things to say.
I saw someone recommended the dentists in Wayzata. That is where we went before we moved and they were fine too. They are on the corner of 394 (turns into 12) and Central (turns into 101).