The main thing I miss about the old theme is the way the album page was laid out, with the cover picture and selected fields at the top, followed by the tracks. The new theme has the tracks bunched up in a narrow column on the right and instead gives more prevalence to notes and credits.

The old theme presented the information exactly in the order of "priority" in which I want to see it: First the cover with selected fields, then the tracks (across the entire page, so that longer titles don't have to break), and finally credits and notes at the bottom.