The mastering of the newer generation of metal records is usually done for digital, and they don't really re-master anything for the vinyl release. Most new vinyls sound OK, but in most cases a record released in the late 70's or late 80's will blow a new one straight out of the water.

Many, many vinyls come with digital downloads, though. Personally, I like having a physical media to hold on too. I'm almost too old to hear any actual difference anyway. :D