Its not bad, but I feel like I am in some weird minority who wasn't super impressed by this film. And I absolutely have Rescue Rangers nostalgia.
The plot is predictable enough that there us a joke about the plot being predictable. I also feel like I was supposed to recognize a lot more of the background characters to get that whole "hey look its whatever" jokes.
Honestly the most entertaining part was Ugly Sonic, who got more screen time here than in his own trailers I think.
