It's tough to say. I'd never played a 3D Sonic and did not like the idea. Hell, I was even a little put off by the demo, at first. As I saw a bit more about the game it grew on me, though, and I actually wound up liking it for the most part (still, fuck, Crisis City Zone). For me, there was just a fairly long adjustment period. I think the effort that has gone into the level design really helps it though, and you can't really fail at the game (a Game Over just puts you back to the start of the stage with 5 lives).
If they're dead set against 3D Sonic though, I'm not sure I'd recommend it based on the 2D stuff alone.