I had a similar experience but a different result. I have nothing against my system. What I have found is some recordings that I liked with my old "budget audiophile" system, now sound like crap on my what I'll call my "Upper Mid-Fi" system. I can hear when recordings have been processed to enhance the sound. What sounded full and rich before, now reveals that they added Echo. On other recordings the orchestra balance is off because they boosted the midrange so it sounds good in the car and on a boom box.
I advise staying away from the current crop of classical DG reissues under the "DG Originals" label. I have been slowing replacing the ones I have with earlier releases that were simply the original LP analog recording transfered to CD with no changes. They sound a lot better on my newest system. (or I try to find the LP.) Some new EMI reissues have the same problem. The ones on London Decca are great!!