I'm missing one gif which actually shows what the level is like for those that don't click on the video.
He compares to Mario because Mario 64 had a big impact on gamers in how they felt playing the game. A lot of that wonder is lost now that we've gotten so used to Mario and 3D in general.
Tearaway goes out to recapture that worldly feel. I know a lot of the early footage looked linear, we didn't even know if he could even jump. It seemed like an introduction level, which seeing this video, shows it clearly was - yet many were skeptic. For kids, a lot of this connectivity will be just like how we felt playing mario 64. Sure the technology exists elsewhere (like 3D games on PC back then) ... but look at what they've made!
Please do watch it if you haven't yet and are uneasy.
The problem is the Mario 64 comparison is not valid at all. Mario 64 was very influential and had a huge impact. That is Mario 64's lasting legacy far more so than its quality as a game. Tearaway can't do that. It won't be a big game since Vita is not a popular system, especially with kids. Which blunts its potential influence quite harshly.
That description of a kid getting Tearaway and being blown away? It won't happen. What kid owns a Vita? What kid even wants a Vita? This isn't like Nintendo 64 and Mario 64 at all. I look forward to Vita but it's a niche game on a niche platform primarily only going to be bought by hardcore gamers. Which is fine, but the idea of it being some kind of Mario 64 is out of the question.