Snap! (almost) I already knew Sonic 1, so I saw Sonic 2 just now in preparation for Sonic 3 which is currently showing in the cinemas.
I liked that Tails is in it and was surprised that she is voiced by a female. I grew up thinking that both Tales and Sonic were male in the Megadrive games! Knuckles from Sonic 3 (game) also appears in Sonic 2 (film). Without saying too much, he's one of the more deeper characters. When the 3 animals are all on-screen, they show together as blue, yellow and red which is pleasing on the eye because they make up the primary colours in print.
I liked the 2 lead girls as well, Rachel and Maddie. They were badass in/after the wedding scene when it got messy then using the gadgets to infiltrate the bad guys guarding that mansion.
7.5 or 8 out 10 from me.