The louder part of the equation is a no-brainer. When the Beatles Corp. remastered their albums for CD recently, they made them louder to match other contemporary releases.
So much for being an authentic rerelease of the material. They were remixed.
Its not the loudness per se that is obnoxious ... its the uniform loudness and wall of noise that is rock these days. Its just like constant static. Nothing is shard and clear. There is no variation in volume or pitch.