Honestly think 3.0 is just leagues worse than 2.1
As far as I can tell Drumont's 962 is running stock, the speeds are about the same.
I did a quick comparison at Spa with 3.0 vs 2.1.
3.0 constantly brakes way too late, hits the brakes when it doesn't need to, never takes a proper racing line, lifts off the throttle constantly and thinks apexes are a suggestion. More like the regular AI does than 2.1 does.
Look at this comparison into the bus stop.
2.1 takes it as you expect. Holds to the left, brakes where you'd expect, drives it normally. Hits the apex!
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3.0 at the same point is in the middle of the track, is carrying way more speed by braking late and absolutely bombs past the apex, lap after lap after lap. Cannot drive at all.
The apex comparison is ridiculous, it doesn't know where it is going at all. Good thing it has an extra 200hp on the player to make up for it in the straights.
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2.1 lifts going into the apex of Blanchimont in this car which you don't need to do, but is getting back on throttle by the apex to accelerate out. Not a great performance, but only loses a few tenths against me.
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3.0 pretends the throttle doesn't exist and slams on the brakes into Blanchimont, bleeding off an ungodly amount of speed for absolutely no reason. Again, this car takes this flat. Loses near enough up to a second to me here alone (just like normal AI!)
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I do categorically think this is a worse racing experience than Custom Races provide, by a significant margin. It is a hampered, dumber and slower version of the experience we already have in the game.
A crying shame if you are coming into this expecting a competitive, proper, racing experience. It is a downgrade in all of those aspects.
Yes I am sorry the conditions are marginally different, this race was cloudy up until the last lap but it doesn't matter because 3.0 drives the same every lap anyway.