Two weeks after the highly-anticipated launch of Amazon's first phone, Fire Phone, the negative reviews continue to tumble in.

The three key features that were the most marketed, and most unique features in the smartphone industry, have failed to impress reviewers.

The Dynamic Perspective which used four cameras and sensors to create 3-D effects, the Firefly feature which helped shoppers find what they want based on an image, and the Mayday feature, were less impressive than the base functionality of the phone, according to Technology Review.

VentureBeat reported five reasons that it was not worth buying, which included the fact that it does the same thing as any other Android phone.

But it also prevents users from accessing the usual Android apps, such as Google's email client or web browser, and the 3-D feature is only useful for the one app the phone has, since no other apps exist to produce content for it.

Two of the biggest complaints, according to several review sites and blogs, is the cost of the phone -- coming from a company known for its cheapness -- and the constant push of Amazon products.

BGR went as far as to call it the year's "most epic flop."

"However, despite the negative tone of survey results, we note that even modest device sales could provide some modest revenue upside over the balance of the year," BGR quoted R.W. Baird analyst Colin Sebastian.

The one silver lining for Amazon is that among the contract phones sold on its website, the Fire Phone has been doing the best, according to Quartz.

On Aug. 1, Quartz tracked sales ranking, and the 32 GB Amazon Fire Phone consistently did the best out of all phones hour-over-hour. The more expensive model, the 64 GB, did not do as well, but still saw some sales.