Well, if this guy were a fifteen year old telling his friends at school about Borderlands 2 then that would be fine. However, this man is actually getting paid to write "professional" reviews such as this and it offends anyone that understands the entertain medium in question.
Would it be okay the compare Killer Elite to Pulp Fiction? They're both movies about professional hitmen that shoot people, so they must be the same genre, right? To a twelve year old that just likes violence I could see how these movies might be similar, but to anyone with any familiarity with the art form, to compare these two is absurd.
Could we compare Opeth to Green Day? They both make with the distorted guitars, singing, bass, and drums, so they must be similar, right?
People ARE ALLOWED to be ignorant of things, but when they are they should NOT be getting paid to write about them.