All four reviews complain about the plastic design. And if you don't have time to read the reviews, maybe you should wait until you do before accusing MR of dishonesty.
All things D: "the plastic body felt a bit insubstantial to me"
Gizmodo: "a slippery, finger-print-trapping plastic back that looks like it belongs on a far more downmarket phone."
Engadget: " If you were a critic of the GS3's plastic construction, you'll be disappointed with its successor -- the company's continuing its long-standing tradition of keeping metal out of the assembly lines, building the frame, back cover and faux-chrome edges with polycarbonate. It's a similar -- though lower-grade and not machined -- type of plastic you'd enjoy on flagships like the Nokia Lumia 920 or even the HTC One X+, so it's nothing out of the ordinary for Samsung."
The verge: "Where Apple and HTC have both made beautiful, well-made, high-quality phones, the GS4 has Samsung back in the land of cheap, plasticky handsets...I don't like holding this phone, and I can't overstate how much that informs the experience of using it. It makes an awful first impression, slippery and slimy and simply unpleasant in your hand. My white review unit is completely smooth and glossy, with a subtle checkered pattern that looks textured but is neither grippy nor textured anywhere on its body. Even the silver band around the sides, which is obviously supposed to look like metal, is plastic. Everyone I showed the GS4 to frowned and wrinkled their nose as if it smelled bad, before rubbing their fingers on the back of the phone and then handing it back to me that's the opposite of the standard reaction to HTCs One, which everyone wants to ogle and hold. That's going to be a huge problem for Samsung, because the GS4 and One are likely to be next to each other on store shelves, and at least on first impression there's absolutely no contest between the two."