I played some of the new expansion last night, it was fun until it crashed as I crossed the finish line in my fourth race.
I'm enjoying the rally gameplay though. I've read people on Reddit bashing the pace notes and they aren't accurate to the numbered system used in real rallying but match what SEGA Rally used. I find them OK, although they are a bit late. You can sometimes see and judge a corner before the notes are called.
I've been racing in my Charger Daytona, which was always built for dirt so makes a decent rally car. Anti-lag is fun, I usually use superchargers but switching to turbos with anti-lag seems to have increased performance. Maybe it's a placebo.