I had a very good experience at Corte Madera when I attended. The sports programs were very competitive and the academic curriculum was pretty challenging. I've heard that CMS is not entirely the same as it once was though and lost multiple principles and had some of the best teachers when I was there leaving to different schools.
4th and 5th grade have been a disappointment so far. 3 principals in 3 years, no leadership, lots of changes made to water doen the poorly perforning teachers, so hopefully the middle school is better.
I think Corte Madera has really improved in the last year. The new principal has brought a great balance of innovation and continued emphasis on quality to the program. The new programs for 4th and 5th are giving kids a chance to learn through their strengths.