Give http://www.classicstoday.com/ a shot. The site's name may look familar ... Classics Today is the newsletter that is distributed in Tower Record's Classical department.
Music Web has huge collection of reviews, go to opening page below and search or go to individual months in middle of page.........for instance 11/03 has 398 reviews, use alphabetical guide part 2-7 upper left hand side to navigate 11/03 edition.
The reviews focus on performance with little mention of sound quality, but most modern classical Cds are above average sound quality.......historical issues another matter.
There are literally thousands of reviews here.