One good change that came with the Morrowind update is that the horrible main menu song was replaced. For those of you who don't remember or were not here for the original Beta, the main menu song used to be a superior version of the one we have had for the last 3 years, but they inexplicably changed it at the last minute to a lower quality version. Fortunately, that is gone and we have the new one.
But on the other hand...
Why has all of the boss/dolmen music been downgraded in quality? To the best of my knowledge, all of these orchestral tracks (they did hire a real orchestra at one point) have been redone in a music synthesizing program. I know music taste is subject to opinion, but I am pretty certain that the quality is significantly lower. The vocals and high points sound like they are incomplete at times, now.
As for basic combat music... they are still chasing their tails by making changes every patch, which are doing nothing to improve it. It was at its best during the launch of v2.3.5 (Thieves' Guild) when it started slow and built up the longer you were in combat.
This all may seem very trifling, but music is important to me, and I do not favor all of the random changes they keep making to it over the years.