I was inspired by LokiD's helpful reference thread to make one of my own. This is going to end up being a very long list indeed, so you are all encouraged to pitch in. I'll keep the list updated in this first post. The ones I can think of at the moment: 1. Rain is completely broken. (A) More grip on the rubbered-in parts than off the dry line. This is the opposite of reality. (B) AI continually pits. (C) Puddle simulation not implemented in physics. 2. Unoptimized GT3 pack car models 3. Wrong L/D ratios in all but low-downforce trims of the LMP2 4. Camaro GT3 not BOP'd to current cars 5. Realistic TC/ABS settings not implemented in any but the newest cars. 6. UI (LOL!) 7. Incomplete GT3 power pack dashboards. 8. Simplistic gearbox/drivetrain. 9. Spastic AI behavior at certain tracks. 10. Disappearing cars (not related to max. visible vehicles.) 11. Illogical damage. (A) Big hits often do too little harm. (B) Cars easily lose alignment from very minor hits. 12. Long FCYs because AI doesn't know what to do. 13. TC/ABS settings off by one notch between garage and track.