A lot of materials science is highly experimental, so it's not super easy to teach advanced skills. I went to a top 10 materials science school for my PhD, and the absolute vast majority of what I learnt was self-taught. However there is a caveat - I self-learnt by doing, and failing multiple times. The advantage of a high ranked school is that the research facilities are top notch and professors bring in external grants, so the research facilities are always maintained at a high standard through overhead costs.