So, why is Sonic 1 and 2 (the 2D ones) not linear? Because you mus go from left to right. Goal is at the right, bottom of level (Level 1). But how you get there is up to you. You can go up, above the waterfalls or looks or use the top loops, fall down, use tube in the middle or top, or run down below and jump over the spikes. So you have start and end but multiple ways with one constant: gravity. If you fall, you have to collect some rings and run forth but below 4 or 5 other paths. That is completely gone with 3D. Now if this game has multiple ways, then they must be provided left or right from other paths. If there are no branches, then you are fucked. If there are no wall left or right, you do not know what path you are on. So maybe another 2D sonic would be better?
I do not trust almost all big gaming portals, may the be named IGN, Gamespot or Hullabaloo, because half of their Previews are bought, some are politically coloured and some are in the taste of American gamers. Forgive me for saying that, but European, American and Japanese tastes are not quite the same. I do more trust print magazines and they rated Sonic games 70 % at the most, maybe 75, but 50-60 too! So see? Not good enough for me to spend 50 EUR or even 30!
But if this game is like AmazingJanet says, then I am relieved, because all I want is a great Sonic game! I want to buy one!
And I won't say anything about graphics. This youtube video is utterly grainy and I can't say anything about graphics!
The nearer the camera, the faster the game seems to be. The faster the game is, the poorer collision-rate must be to let people time to react.
So I will read the Preview, but trust no rating these big gaming sites provide. You can not trust their rating, but you can trust Cubed