top 5 reasons:
5. They don't have hardcore/metalcore vocals.
4. They don't have hardcore/metalcore riffs.
3. They don't have hardcore/metalcore beats, other than their breakdowns which honestly sound more like Pantera with a flatter and more linear syncopation, and even then they don't have very many of them.
3. They don't have hardcore lyrics/artwork/"image"
2. They don't sound like any hardcore or metalcore band which would have been called hardcore or metalcore before they came out, before people starting saying shit that sounds like Pantera is "-core".
1. They sound like Pantera.
also:
they sound like Slayer and Metallica, like every band of d00ds in their late 20's/early 30's that i have ever known.
...
i don't hate them at all, they're a good, kind of generic semi-extreme metal band, i thought the first album and the Burn The Priest one, at least, were well above average, and As The Palaces Burn, I thought, had some exceptionally good material, though that's mostly a credit to Devin Townsend.
the new one is pretty lame, tbh, and i don't particularly care what they do anymore cause i feel they've shown themselves to be creatively uninspired and somewhat incompetent when they don't have a decent producer.