Anti-Climax Boss: Suffice to say that a Wraith (granted, fully upgraded and with everything from the Underground Market) can take down the Adversary. With a fully-upgraded Deliverator with a good management of Rocket Fuel? You can lap him.
Awesome Music: Most of the soundtrack, courtesy of Purple Motion, including:
"Hard Metal", the intro theme and the theme for The Arena, the Adversary's track. It's so awesome it even became the announcement theme for the reboot.
"Whatever", the upbeat theme that plays on the Downtown/Newark tracks.
The techno-esque "Fast-D", the theme of the unforgiving Complex/Utopia tracks, wouldn't sound out of place in a shopping.
"HiSpeed Track II", the catchy theme which plays on the Snake Alley/Desert Run tracks.
Catharsis Factor: Bumping enemy cars into bystanders, equipping spikes and then crashing into other cars, or dropping mines when cars are right behind you...
That One Level: Utopia/Complex and Holocaust/Toxic Dump tracks in the original game have very complex layouts and some tight areas where you could be penalized. The latter even falls into Early Game Hell, as it can only be found in the Easy track tier, while the former can only be found in the Medium/Hard track tiers.