Good watch, could watch again, and can recommend.
This is surprisingly good, and I went in with really low expectations. Sonic has a long and very weird fanbase, along with a series of weird, weird choices in game designs.
The concept is very forced, but once you get past that and into actual Sonic content, it is actually a lot of fun. Jim Carrey does a wonderful version of Dr. (Eggman) Robotnik, and the change to him originating in on Earth 1 actually works really well.
I feel like there is a possibility for a series of movies surrounding the dark organization Robotnik was from. Carrey, Marsden, and the Sonic character have a some great chemistry.
While its not a great movie, it's definitely a lot of fun, and I think that is the right choice for a Sonic movie.