Like many others, I got into Opeth through the masterpiece Damnation. I was really not a fan of growling (and I still dislike most bands who use it), but Mikael Åkerfeldt's songwriting on Damnation was so amazing and influenced my own songs so much that I just sort of had to take the risk and buy this new "regular" Opeth release.
I'm very glad I did.
Strangely enough, the heaviest song on the record, Heir Apparent, was - besides Coil of course ;) - the first track I really got into and it's still one of my favourite Opeth songs (I also bought Deliverance and Blackwater Park in the meantime).
Hessian Peel is really the standout track for me on Watershed. The way it builds up, the divine "verse" part and the heavy climax make this song one of the best I've heard in my entire life. It just captures everything I love about Opeth.