7/10 to me if I had to rate it. Great blueprint, as I expected.
The writing and story were well executed for the most part, it is visible how there was genuine depth, care, and effort put into it. The style is also great for Sonic which certainly includes the music and I especially like the designs of enemies (ninjas are my personal favorite) and Titans, especially the combat against them. I also enjoyed the open world as it is something we finally got in a Sonic game as we should've. I also really like the whole ''anime feel'' the game has with its overall style and music. Sure it wasn't a perfect game and had a handful of flaws of course (and the whole franchise itself still has things to fix in my eyes), but it was definitely a breath of fresh are compared to what we've gotten in Sonic games for more than a PAST DECADE.
So, yeah.