I found that older Opeth stuff hit me harder right away but didn't have that same impact for long. This goes for everything up through Blackwater Park. Starting with Deliverance, I've found that newer Opeth stuff doesn't take off right away for me, but is more rewarding experiences over time. My Arms, Your Hearse did blow me away at first. It's still a very good album, but I'm more of a newer material fan.