I wasn't surprised by your comparison. I've owned 2 Oppo 971's. one Oppo 981, one BDP-83, 2 Marantz SA-14's, one SA-11, one SA-8001.
I bought the Oppo's after reading about them at Audiogon and at Audio Asylum. Not terrible sounding, the Marantz players just did/do everything better. (Dynamics, staging, focus, tonal balance, etc.)
All of the Oppo players failed within a year or less. Some of the Marantz players are pretty old, and still work flawlessly.