The problem isn't that they look shitty to pixel artists or experts, they look shitty for anyone with a bit of observation.
It's junk art the same way Mc Donald's is junk food.
I think we could do a bit better here with the explanation of what looks bad to you..
- the magenta background is still visible along the edges - the color palette is all over the place - random noise pixels of totally different colors are visible scattered around - the lighting and shading doesn't look that good
There's plenty of real food that is as heavy and as salted, and as such no healthier, than junk food. But it actually tastes good. (I can't exactly put the finger on what makes an Italian pizza better than a US 7/11 one, but it's not about the former being healthier).