I love the new car pack.
The Altimaniac is a beast and is actually fairly stable in stock form if you're easy on the gas. I used it for the Hot Wheels championship. It felt appropriate, lol.
I love the new Saleen truck as well, but it does show the ugly spot of missing the Saleen S331 and S281E from previous games.
The Huayra R sounds insane and the Lotus isn't bad either, but I haven't driven either of them yet outside of the Rivals event for the Lotus.
The Donut Media story isn't bad and I like the upgrade on the fly nature of it, although now I have a third Fairlady Z I don't need, lol.