My experience has been extremely varied-- some remasters sound better to me and some sound worse. I made the mistake of buying the version of Layla most favored on the Steve Hoffman site (a Japanese SHM) and found it unlistenably bright. My system was quite warm and I failed to comprehend why the Hoffmanites liked it so much, given its (for me) fatiguing sonics. On the other hand, my Japanese DSD mastering of Blow By Blow sounds fuller and warmer than the generic domestic version. I prefer the Virgin remasters of Sticky Fingers. Let It Bleed and Exile On Main Street as well. These are just a few examples.
Everyone hears differently but my experience has definitely not been that all remasters have consistent sonics. Unfortunately, some albums were simply not well recorded to begin with.