I would love to visit every Deaf school (it has been something I have always wanted to do) and for me to form an opinion about all, I would have to visit each one personally.
I have worked/observed/volunteered at approximately 7 deaf schools and I can say with a certainly they are all thumbs up. Sure, they are not 100% perfect but no schools, including public and private, are perfected anyway.
I have worked in mainstreamed deaf ed programs and there is one that I feel is very good but the rest were poorly run leaving the children's needs not being met most of the time.