I think they did a good job with this. The design of Sonic so so much better than the one featured in the trailer. It baffles me how they thought the original design was ok. It looked like a child's drawing of something they had seen in a nightmare.
The relationship between Sonic and James Marsden is super cute too and you'd do become invested in it.
It is very much a kids movie but it's nice for older people to see as it's filled with nostalgia from the Sonic games. There are plenty of little Easter eggs that people who have played the game will notice.
This movie is also really charming. It has lines that are funny too.
So I would watch it especially if you have any interest in Sonic I don't think you will be disappointed or frustrated at what they have done with the property.
Charming and Nostalgic