People keep comparing this with the iPad and the article does mention iPad rating but it mention those of the previous Kindle too.
From Amazon:
Kindle Keyboard (formerly 3rd gen): 34,590 reviews: 72% - 5 stars, 17% - 4 stars, 4.6% - 3 stars, 2.5% - 2 stars, 4% - 1 star
So, 89% give the all Kindle 4+ stars and by that measure the new Kindle Fire has not been that well recieved.
Numbers are not everything, also. If you read the old 1-star reviews you'll find mostly people with hardware problems but most people were saying the equivalent of "If you get a good one you'll be happy with it" (And a 6.5% failure might be acceptable to Amazon, who knows?). This time, 1-star reviews are really grinding Amazon.