The entire rallycross portion in Dirt Rally 2.0 is completely unplayable in singleplayer due to completely broken rallycross AI.
I reported it on the official forum bug report thread for a YEAR but Codemasters never once even pretended to give a toss.
Their community mouthpiece brags about their super hyper advanded AI, meanwhile in the real world the broken rallycross AI makes rallycross unplayable. A huge amount of great rallycross tracks and cars goes down the toilet because they are in denial about their broken AI.