Drift Street International's nine courses take you from the US to Japan and even the UK. Courses never really offer a feel of their host country, but as I said earlier - who cares?
Courses place more emphasis on drifting (it is in the title) than simply trying to outmaneuver opponents. Though courses feature a few straightaways, you'll come across a number of wide curves you need to drift through. All three race types are built around mastering the drift-and-boost mechanic. Race pits you against other cars, while Checkpoint and Speed Trial remove opponents, replacing them with checkpoints and timers.
Drift Street International is based around unlocks. The garage is rather boring and based solely on giving you cars with better stats. Where this a cart-based game, I'd complain but considering Drift Street is an $8 download, it isn't too bad. The only bad part is unlockables seem completely random sometimes. It's hard to work towards a certain unlock. You're forced to keep playing until you randomly unlock some reward.
In addition to single-player races, Drift Street International also supports multiplayer. This is a great addition and boosts the game's merits even further. At the same time, you need to find other players with the game. I was able to snag a few after showing the game off, but some sort of single-card play mode would have been a nice touch.