I'm just listening to the album on Spotify. This is one LOUD album. The songs are great, but these have had the absolute bejesus compressed and limited out of them. Eddie's right, this is some really bad mastering. It won't seem like it unless you've got a good set of speakers and know what you're listening for (or in my case, I'm listening on headphones) but it's 'Death Magnetic' all over again. It's not as bad as 'One by One' with the mastering, but it's close.
Overloud digital mastering. Sorry, it doesn't fly.
This video explains it all much better than I could.