Is it just a change in interface with no loss of information? I haven't spent much time on it yet, but I haven't been able to figure out how to get the new interface to work in a way that gives the information of the old one. The old AMG gave a career retrospective for each artist, including a chronologically displayed discography that included in and out-of-print albums. Compilations were catalogued seperately. It was still vastly incomplete, of course, but still a valuable resource, particularly when a serious and knowledgeable reviewer was involved. I don't yet see how to retrieve all of that with the new interface. I hope that there is some way.
It's very simple - take John Coltrane, for example: under his name in the top left-hand corner you'll find the link to the discography, which is still chronological. On the discography page you can choose between "main albums", "compilations", "singles/EPs" and "DVDs and videos" at the top right-hand corner. Click on a title on the discography page and you'll get the review - for what it's worth I don't see the problem.