We *love* Waldorf and find it an absolutely perfect fit for our DS. But I am very aware that it isn't the best system for every child, and certainly not every family.
Not as a comment about you, but re. the parents in DS's class, I often hear that they (the moms and dads) are concerned about 'boredom'. Our ps does the same story for three weeks, I think. And they do it in that waldorf way, where it's recited, rather than read. It's a long time w/ the same story, every single day. But for us, I think it's a small part of a larger puzzle. Yes, I think DS would probably prefer a bit more variety, but I don't think this one thing is a critical. Yet I do hear a lot of parents "complaining" that their child will get bored, citing the story thing as example. And, interestingly, I hear the staff saying that their children are empathetically not getting bored. Again, this doesn't seem to apply to your situation, but I just wanted to comment since you mentioned the lack of stimulation and it's something that I'm aware of with DS's school as well.
As far as rhythm, yes, definitely a lot of "ritualized" activity. But each day has it's own focus (Sunday bake bread, Monday water color, etc. etc.) and then there is seasonal stuff added in, too. Is that the same at your DD's school? Or is every day the exact same?
I also agree with the pp's who commented on how different Waldorf is than the rest of "society" and that that makes it hard for some kids to find their place in a Waldorf environment. I see it analogous to the toys. When I first walked into DS's classroom, I thought -- hmm, very simple, too much so? I was so used to the stimulation of color and noise and figured that DS would be, too. He loved it immediately, however, and his very, very big imagination had plenty of room to soar. Ironically, when I was looking at places for DS2, I looked at a more traditional daycare and was almost dizzy at all the "stuff" -- on the walls, the floor, the table tops. It was like my eyes didn't know where to focus, and yet, just 2 years ago, that was totally the norm to me. So, absolutely, the Waldorf environment -- even with amazing staff -- may require some readjusting to, for both kids and parents.