The AI is still bad, but it's miles above GT-Sp. One thing I swear by, but can't quantify, is the AI actually races you extremely well and clean... but only on certain tracks. It's like PD spent their AI time on some tracks but ran out of time for the others. I've had some fantastic races with the AI on N24; often side-by-side through multiple turns where it leaves me space and I leave it space; sometimes I win out and other times the AI does.
Other tracks we'll be in a drag race on a straight it it'll just turn into me like I'm not even there, sometimes it's bad enough where I'll get PIT maneuvered. I swear that noise costs me the CRB more often than not. Or going through a turn, nose to tail... hit the apex, ease on the gas and the AI brake checks me at the worst possible time... welp, there goes my CRB, thanks a lot!