Edit: Sega has released some updates to this game since I wrote my review. Crazy Taxi now has working Steam achievements and can run at resolutions beyond 720p. These are improvements, but I still wouldn't recommend buying the game at full price. The updates are certainly welcome, but they don't change the limited gameplay gameplay and the lack of the original soundtrack.
I have played a lot of Crazy Taxi, and although it's fun, this version is not worth buying. This release is exactly like the arcade version, the Dreamcast version, and the numerous ports that have been released over the past ten or fifteen years. In terms of gameplay, it brings nothing new to the table. The two main game modes are Arcade Mode and Original Mode. In these modes, you pick up passengers and bring them to their destinations as quickly as possible while performing stunts along the way. From what I can tell, the only difference between the two modes is where you spawn at the beginning of the game. The gameplay is enjoyable, but it gets repetitive. Once you're bored with those, all that's left is Crazy Box, a collection of challenges. Crazy Box doesn't really add any depth to the game; once you complete it, you won't play it again.
You might be tempted to buy this because of some sense of nostalgia. Unfortunately, you won't be able to drift into the parking lot of KFC while blasting All I Want. Due to licensing issues, this version of Crazy Taxi does not have the soundtrack and branding that the original did. I know that you can restore the original soundtrack by doing some modding, but I do not think that it's possible to do the same for the branding.
Looking beyond the licensing issues, this is a very crappy port of the game. It cannot run at resolutions higher than 720p, and the textures still look blurry at that resolution. They definitely have not been retouched in any way, and I almost think they look worse than they do on the Dreamcast. The in-game voices are incredibly compressed and sound terrible, but they can be fixed by replacing the files with rips from the Dreamcast version. Additionally, I'm surprised that a score-oriented game does not have online leaderboards.
For some bizarre reason, Sega has recently started updating the game. They added placeholder Steam achievements a couple of weeks ago, but you cannot unlock them yet. While I'm impressed that they are updating a game that is several years old, I doubt that they will make any substantial improvements.
Crazy Taxi is a solid, entertaining arcade game. However, I don't think you should spend $8 on this version when you can get a way better experience at an arcade for a few quarters.