Its someone's opinion he doesn't have to sit there and prove to anyone why he thinks its the best.
No, but to state in his opinion it beats everything, if he doesn't state what "everything" is for all we know his pervious device might have been a really low end device so it's hard to comprehend how much his opinion is based on comparison or just him being dead happy with his firestick and not feeling the need to try any other devices.
The point I'm making is that it's all relative.