It's alright! James Marsden is kind of phoning it in, and his girlfriend/wife might as well be invisible, but Ben Schwartz's manic 'tude perfectly encapsulates Sonic and Jim Carrey is channeling some raw early 90s Jim Carrey The Mask energy.
It's kind of hilarious that they turned a Sonic film into a road trip comedy halfway through with strange Olive Garden product placement.
Overall as far as film adaptations of a video game go this honestly could have ended up being real awful, but there are a number of moments that got a genuine laugh out of me.
It's pretty alright!