I don't like the art.
As an example, I think Jem is supposed to have a "good girl" design, countered by Pizzazz's "bad girl" design. Pizzazz is sexy and threatening, while Jem is sexy and non-threatening. 80's Jem's primary outfit is a nice looking one-piece, which looks sensible, comfortable even, but it has a very short skirt. Okay, nothing wrong with that. And then her shoes are rather basic. But the short skirt and the small shoes combine to make a statement of "look at my sexy legs". She's being deliberately sexy, but she gets away with it because of how she goes about it.
The new Jem is wearing a coil that would probably fall off of her if it wasn't under constant tension. There's no subtlety, and she's showing more to accomplish less. Also, those boots are awful. Everyone's footwear is terrible. And they ruined Jem's earrings. I think Pizzazz has a decent design, although I can't see her shoes, so maybe that's why. Also, her face looks like 12-year-old Aang from Avatar the Last Airbender.
I will say that updating a classic design is like walking into a minefield. Some people will love it, some will hate it. It's to be expected.
On a positive note, here's one of Amy Mebberson's variant covers.