Parents may have serious issues with this sort of seedy subject matter, like breaking the speed limit and gambling with other racers for their cars or money, but in keeping with the aloof nature of the game, it all comes across as lighthearted fun.
Hardcore racing fans should look elsewhere for their racing fix as Speed Devils is one of the most over the top racing titles this side of San Francisco RUSH. There is no realistic physics engine and car maintenance to get in the way of the racing action. You may be happier with Sega's upcoming racer, Sega GT.
Arcade racing fans will probably find themselves right at home with Speed Devils because from beginning to end, it is fast and unorthodox racing action. However, given its dated graphics, and lacking playing modes, not to mention its limited two-player mode, relegate this title to the "rent first" pile. For most definitive arcade action on the Dreamcast, I would suggest Sega's Crazy Taxi.