I think like most people that seem to dislike Watershed, I like it but only think it's not up to the standards set by the 8 previous albums.
We've had way too many arguments about Opeth/PT lyrics here so let's not touch that lyric thing again as its supposedly debatable. The female vocal thing also doesn't mean a lack of creativity, I only mentioned it because while it isn't a bad thing, it isn't super creative either like some people seem to think (a lot of people connect female vocals in metal to avant-garde metal in certain cases). The super mario solo is also not bad, I just think it gets too much praise for a part that really doesn't fit perfectly in the context of the song.
So yea, that's several points and I have not said Watershed is bad in any of them, simply overrated. The points where I feel there is a regression is in the shredding solos and some of the riffs. The solos are obvious to anyone, there's plenty of shredders that could produce that sound. Just because it isn't John Petrucci doesn't mean it's not shredding (I believe someone made that point, what a fucking dumb thing to say imo). I like the shredding solos but I think its still a regression because it means adopting a style that a myriad of metal bands use whereas the old style was a unique mixture of prog rock solos and metal guitar tone. Again this is not a bad thing universally, it's only bad given the circumstances because Opeth could retain the unique nature of their solos - as is evidenced in The Lotus Eater on the very same album - but chose to go where hundreds of metal bands have gone before. As far as the riffs go, it may not bug a normal listener at all, but anyone who has played songs from multiple Opeth albums should be unable to deny an overall regression in the complexity and uniqueness of the riffs. There are exceptions, such as the leads before the first solo on the Lotus Eater, the instrumental riff around 1:30ish in the same song, or the complex riffing after the solo in Hessian Peel, but overall there is far more usage of open E chugging, power chords, and octaves in these songs than in the previous riff-oriented albums. I like Heir Apparent as a song, but as far as the riffing goes, there's no denying it looks like Smoke on the Water in comparison to some riffing in The Leper Affinity, The Amen Corner, The Moor, Ghost of Perdition, Master's Apprentices, and many other Opeth tracks.
Then there's that whole issue of atmosphere which is also supposedly debatable so let's not go there.
Consider this a shit thread now, my bad guys.