A large portion of the library is definitely very arcade-oriented, that was SEGA's angle at the time and to be honest, it's not surprising considering the fact that they've been in the arcade business for ages, they're in it to this day and that's what they're good at. I think it makes the Dreamcast library especially unique, it offers an experience quite unlike anything else in its generation.
True! And I'd like to point out that it seems odd that even to this day Nintendo has never released any of their own arcade games in true arcade form on any console.