Rip Rowan over at prorec.com did an analysis of 5 different Rush CD's released from 1984 to 2002. The results show a definite trend in the recording/mastering style from each album. Rip contends that louder is not necessarily better as the record execs believe. The artist however, is often left with little choice in the matter.
http://www.prorec.com/prorec/articles.nsf/files/8A133F52D0FD71AB86256C2E005DAF1C
http://www.prorec.com/prorec/articles.nsf/files/8A133F52D0FD71AB86256C2E005DAF1C