There are different Steiner schools and different systems that suit different kids. Dd1 moved from our local state school and has had a blast. She is interested and involved in what she learns, she loves the singing, the painting, the knitting, the early modern languages, the story-telling, the drama and the more religious aspects seem to pass her by.. We'd rather not bringtoo much school home and we enjoy normal levels of tv, computer games, plastic etc etc. This has never been a problem for her.
In contrast, however, it really isn't suiting ds1 -different teachers, different type of child and we're moving him to a state school in Sept. That doesn't take away from dd1's experience - jury's still out on what we'll do with dd2.
Having spent nearly 3 years in a Steiner School, I can completely understand where northern, barking and the rest are coming from (there certainly are some outrageous things said and believed in Steiner schools, but, at ours there is often room to disagree and even have the odd barney ) Despite the problems, IMO it does seem to really work for some kids. - and let's face it - KS1 really doesn't work for some kids.
I honestly believe that the only way to know whether a school is right for your child is to follow your instincts and to try. If it doesn't work out, you can always change your mind. Nothing is set in stone - no school will have all the answers.
Hope this helps.