It seems to still be popular. IDW(the guys who do the MLP comics) have been publishing new comics of it. And its on Netflix as well as being on Hub for a time.
It's no Transformers or My Little Pony, but it's still has a fandom.
My Tumblr "If theirs one thing I'm good at, it's blowing" Jesse Cox 2013Brad Jones Midnight Screening review of the movie.
Haven't watched the video yet, but the description mentions that it's the "loosest adaptation of Jem and the Holograms".
Also, because these videos usually go into detail about what was just watched, movie's gonna get spoiled a lot.
My Tumblr "If theirs one thing I'm good at, it's blowing" Jesse Cox 2013The Box office reports are looking bad, as in so terrible that it might manage to loose money despite being made for just 5 million.
From what I've read it's a case of making a movie without a lot of broad appeal that alienated the people who were nostalgic for the source material. So essentially they made a movie that managed the impressive feat of appealing to no one.
Just going by the trailers, this looks over-earnest, over-serious, and sounds otherwise entirely too much like what you'd get if you layered those factors over Hannah Montana. To get Jem right you need melodrama and unlikely situations. And Synergy, and holograms.
This happens entirely too often when stuff like this gets adapted. The adapters don't seem to think the audience will buy the more outre elements, completely forgetting that audiences already have.
Jem & The Holograms makes history!
...by being the first ever wide-release movie to be removed entirely from every screen after only two weeks, the numbers were so beyond terrible the studio didn't want it to bring down their 2015 box-office average.
edited 29th Nov '15 1:20:57 PM by LE0Night

I hate to be the bearer of bad news, but there's another Jem trailer out.
And hey! This one has Synergy. Or at least, there's something CALLED Synergy.