I've thought about what I was really missing and have come to this conclusion - songs like Burden are sweet and Opeth should keep doing them, but on Watershed the two main things they lost are creative metal riffs/melodies and some vocal quality.
On the riffs - really the only distortion riff that was that creative on the album was Hessian Peel (Also Hex Omega, but that song was pretty meh tbh) I'm not asking them to go way back to Still Life days or something and write lead guitar parts like you see in The Moor, Serenity Painted Death, and Moonlapse Vertigo, but really, they even had much less generic riffs on the last one with the leads in Harlequin Forest, the all around unique riffs of Beneath the Mire, and more interesting rhythms in Ghost of Perdition. In Watershed, well....Heir Apparent = mostly chugging open notes with octaves and an occasional lead bit thrown in, Hessian Peel = the two riffs after the solo are really good, the other three distortion riffs in the song are incredibly generic, The Lotus Eater = outside of the riff that goes on in the second minute, this song is pretty terrible for riffs - thank god it has amazing leads, Hex Omega = just a tip...don't waste good riffs on bad songs lol.
With the vocals - obviously it was a great clean vocal performance but that's all it was, seems like Mike is just showing off on the clean vocals a lot. To me a lot of the cleans lack feeling because of said showing off. And the growls are just nowhere near as good as...well any of their other albums. Mike's growl is much more straight death metal now from what I can tell whereas the other growls actually had some feeling.