How so? It's obviously a very simplified and stripped down take on what others had done previously. Certainly when laid next to albums already released by God Macabre, Carnage or Dismember, Clandestine pretty much has to be seen as lacking the same level of complexity by way of comparison. What's missing is the interplay of tone, texture and rhythmic variation that other bands in the scene were exploring. Instead, Entombed adopted a rhythmically one-dimensional rock-style compositional approach that is immediately obvious (and thus immediately accessible), but ultimately shallow and creatively dull.
One major problem is the over reliance on consonant intervals, both internally within lines of melody and within what harmonies exist on the record. It makes for a decidedly syrupy and saccharine feel that is, I'm sure, quite appealing to the mouth-breathing masses, but is a huge turnoff to the intelligent, informed listener.
But the bigger problem is the absolutely pathetic absence of any meaningful rhythmic variation. Virtually every riff of every song - without regard for absolute tempo or picking technique - utilizes a rhythmic pattern that puts the stressed beats (which is essentially what you hear and remember from any rhythmic pattern) in essentially the same places as in every other riff on every other song. Not only is this painfully formulaic and utterly uncreative, it's fucking boring, as the inevitable end result is that every song on the album sounds pretty much just like every other song on the album. It's not sophisticated. It's not polished. It's not good.
It is, however, good for business.