Competing with 2-4 hour games, this could easily be one of the best. The content, however, stretches upwards of 12-16 for just a thorough completion of the World Tour campaign. Remaining is atleast one additional DLC campaign, rotating challenges, extra tournament modes and multiplayer. Stretched to that length, the track design shows its limits, fighting to fill each new location with unique art and background pieces.
The appeal is on the box. You have arcade-style (read: cars move in line with how your brain functions rather than a real car. The music and colors are vibrant and, early on, you definitely reach 'zen' moments: that ideal that racing games strive for where you're chasing first place or just the sun. The game earns its name.
The main campaign feels about 20% too long. A player jumping into the game, as I was, may be ready for a break long before beating it and will not have the momentum to jump into the additional modes (primarily multiplayer). I like to think, though, that I have another 'full first playthrough' left on the shelf for a future date.
When racing for 'Super Trophies' (or the terrifying unlisted achievement of getting 'full coins' on every race), you will typically find yourself in a pattern of beating one race quickly, while the next takes you a few tries. Only a couple of races took an entire sitting to beat or monopolized my time. That said, after 60 or so races (and rotating content uses the same format) I think the in-race collectathon elements far overstay their welcome and clash with the rest of the game's 'purity'.
The track design also becomes a limiting factor. You have environmental hazards like littered objects, different surfaces (dirt, concrete, shallow water), weather, and every angle of turn imagineable. By the end, though, they have mined ever combination you can imagine. In future development or sequels, I hope they are able to integrate other relatively 'pure' concepts such as mobile obstacles, split paths, ramps/jumps, shortcuts (or more obvious cuttable-corners) as well as mechanics to further differentiate the vehicles, while still fitting within the arcade persona.
When calculating in the cost of ambition, the game may be off the mark but it is not off the rails. It succeeds far more often than you can imagine and punches far above its technical and graphical limitations. Nowhere else in my library can you find such innocent and beautiful speed.