We love the kindy set up here, so different from the UK and based on what kids need at that age - social interaction and play - they're kids after all and learning can be done when they get to school.
Our local kindy has 45 kids to three full time teachers, 2 teacher aides, and a parent help, also special needs teachers are often around. The kids get a lot of interaction with the teachers when they need it.
All three of mine have been through kindy here and have gone on to school with no problems at all. In fact I think it's done them a lot of good in some ways, they haven't been pushed in to being told to read and write until they got to school. I'm no slack parent by any means, my daughter could hold an adult conversation at 12 months and she's in to her books and drawing which kindy helped with even more. She's now at school and doing better than ever, half a year at least above her age group. My eldest boy despite not being able to read when he started school (he's nearly 8 now) has a reading age of an 11 year old, something we never thought he was capable.
I have my youngest starting school in February and he started kindy back when he was 3. He seems to have got the most out of it and is very social, most of the kids he's friends with are going to be in the same class, think about 8 of them all start within the month
I would wait until you come over and visit the local kindy, it's pretty impossible to see how things work, I wouldn't go on ratios either as all the kids seem to get time with the teacher at some stage or other with the way activities are set out