tearaway looks like it'll be a super linear affair with some neat sidesteps for extra challenge along the way and that is totally and completely fine. it's not really like super mario 64 because tearaway seems to constantly be pushing the player towards a single goal without taking them to a hub world or asking them to unlock the next area by finding so many widgets and whatnot. that's not a knock against either game- they do what they do well, but they're different.
i do agree with the notion that tearaway looks like it will probably be the most original 3d platformer since mirror's edge. from what i played it did not feel like a floaty do-it-yourself media molecule game, but a more personalized affair. the charm was genuine, and it centers around guiding your little dude or dudette to deliver a letter to... well, you. i'm not sure why i find that so fascinating, but i do. i think it helps that media molecule goes to great lengths to continuously incorporate the player into the game using the vita's features, and even though it's gimmicky, it never feels forced.
if this thing turns out to be a chunk of meh, i'm going to be incredibly disappointed.