I understand what the original poster is saying. However, it's not so much that Opeth have gone downhill since Still Life, but that they are victims of creating a genuine masterpiece in Still Life. The albums before and after Still Life are exceptional albums, and I love them all. But there is a unique magic in Still Life that eclipses all the others. For me, it is one of the best rock albums ever made, for the reasons the original poster touched upon - the atmosphere, the organic flow, the exceptional riffs, the story-telling, the lack of self-consciousness.
In many ways, the subsequent albums are self-conscious attempts to recreate the mastery and magic of Still Life, and while this drive has produced a lot of fantastic music which any band would be proud of, it still doesn't quite match the level that Still Life reached - in my humble opinion, of course. But really, rather than criticize Opeth for this, we should just be thankful that they have managed to create such a wonderful work of art that is Still Life, and be content to enjoy everything else they have to offer.
In many ways, the subsequent albums are self-conscious attempts to recreate the mastery and magic of Still Life, and while this drive has produced a lot of fantastic music which any band would be proud of, it still doesn't quite match the level that Still Life reached - in my humble opinion, of course. But really, rather than criticize Opeth for this, we should just be thankful that they have managed to create such a wonderful work of art that is Still Life, and be content to enjoy everything else they have to offer.