Couple from cars which i have owned:
1) Seat leon's require you to pull the door handles twice to open the door, once to unlock the door, once to open it. Why doesnt it unlock and open in one action?
2) BMW E46 window switch placement, my OCD retard disorder means that i cant only have one window open, thus i always want to open both front windows, or all 4 windows, on normal cars where the switches are grouped you can do this with one action with a finger on each button, on the E46 they are too far apart to reach. Same applies to my old omega too with similar window switch placement.
3) MR2 flippy headlights created loads of wind noise at >100mph
4) S-class folding mirrors, you have to hold the button, wtf :/
5) S-class manual gear selection, whats the point, never use it.
6) S-class heated seats, they gradually cool down to the lowest setting, which means if i want to be roasting hot, i have to turn them completely off, and then on again to select full heat again, rinse and repeat constantly throughout long journey.
7) S-class no-where to put your right foot, so it ends up either hovering above the pedals, or on the floor infront of them in a rubbish position. Why the hell didnt they put a foot rest to the right of the accelerator?