Slayer's last real (real good) album was Seasons. The others since had their moments (the first three songs offa GHUA for example), but not enough to live up to what Slayer used to be. I really hoped that reuniting with Lombardo would put the spark back in the band, but as soon as I heard that Josh Abraham was producing, I knew that it would blow.
at least they've been around long enough to be completely professional, but yeah, the spark is gone, not to mention, so many other bands have latched onto their schtick that they're not even outrageous anymore.