It's highly underrated game, mostly because fans of series expected another Ridge Racer with number next to the title, not the spin-off. But it's not their first spin-off. Remember R: Racing Evolution from 2003 and Critical Velocity from 2005?
Ridge Racer Unbounded is a mix of Burnout, Ridge Racer (obviously) and Trackmania. Mostly in races you will see the combination of Burnout and Ridge Racer but in some time attack events you'll be jumping on platforms just like in Trackmania. And there's more modes. Drifting events, frag challenges where you have to defeat as much opponents as possible. There's a lot to do and game doesn't feel repetitive even if most of time you spend in same city.

Back in days it got released I bought physical copy but not for Ridge Racer but for fact it was made by Bugbear, studio I highly respected back then and still do. Even if their games had more realistic driving model in comparition with this one it's still a fun factor. When those devs make something it's just pure fun.

One of the, if not The most challenging and toughest racing game i have ever played, specially the final time attack run!
10/10

Better get Burnout Paradise or Flatout