Oh yeah, I review anime.

Piccolo is concerned that Gohan is no longer training especially when he's doing more errands for him such as training his daughter Pan, and with Goku and Vegeta training Broly to be a better more controlled warrior, Piccolo is worried they are unprepared for the next attack.
Cue the Red Ribbon army as Magenta, the son of it's former leader recruits Dr Hedo, the grandson of Dr Gero. Piccolo infiltrates the group after fighting the newest android called Gamma 2 and learns of a much bigger threat known as Cell Max; knowing that Gohan is a target, Piccolo pretends to hold Pan hostage disguised as a Red Ribbon Army grunt in order to trigger Gohan into battle.
As Gohan and co fight the two Gamma androids, Cell Max is released triggering the final battle.
Two ways to look at this.
Super Hero acts as a nostalgia trip along with a look at what Dragonball Super is starting to become and had we not known at the time that Toriyama would pass away, a look at what the franchise will look like with Toriyama getting less involved. It's also nice that Piccolo is finally getting some proper screen time.
On the other hand, the plot reads like a fanfic and it's hard not to see future projects going the same way, it gives me flashbacks of early 2000 internet rumours of Dragonball AF, a series post GT with ever increasingly ridiculous super saiyan forms and Gohan personifies or even references this with his Beast Gohan form.
While I enjoyed the film it does fill me with caution knowing that we are closing in on that AF fanfic ridiculousness from early internet forums, a testament to Toriyama's world that can cater for it and still come out in a decent state.
Dub maintains it's high standards.
Final Verdict: Maybe because I'm old enough to remember the Dragonball AF phenomenon that I can't help but think that Dragonball Super is turning into this but I do feel at least confident that it's in good hands.