So Sanjuro, if you mean the metal referred to by some as True, I agree that the current scene is lacking in ideas (however, I redirect you to the politically charged and angry Thraash Bay era of the early Metallica, Megadeth, Testament, Exodus, the Suicidal Tendencies of the great Mike Muir, or whatever, to Black Sabbath), etc. This type of metal has fallen out of favor, unfortunately, in favor of another type that I don't like at all and I agree that I find it claustrophobic (various Slipknot, System of a Down, etc.).
If, instead, you refer to metal in general, you demonstrate a lack of knowledge of the genre because saying that excellent bands like Katatonia, Opeth, The Gathering, Moonspell, Amorphis, Anathema, Paradise Lost, My Dying Bride, Cathedral, Nightwish, Therion, Tiamat, etc., sound claustrophobic is definitely not true and is a sign, as I've already said, of a poor understanding of the genre.
That's why I don't like that you throw around pronouncements left and right about reviews of bands you don't like, such as Metallica, Iron Maiden, and GNR, without providing any reasoning. You like hardcore? Great! I also enjoy some things and others a bit less. But I wouldn't dream of trashing a band that I know little about without valid reasons. No hard feelings, of course..
Anyway, a really nice review.