Join the club, I bought from a dealer, the fact that my car passed their shops roadworthy is laughable, but being a noob, I didn't spot the little things. So far it hasn't treated me too bad, but I am apprehensive about stuff with the car sometimes. Not a fan of my dealer at all.
Anyway, apart from that my current pet peeve, is the amount of pedestrians who don't seem to understand the concept that "Cars have RIGHT OF WAY on the road" don't even hurry across the road when they see you, and one woman gave me a death stare when I honked at them. Use a pedestrian crossing or give way to cars......
sigh.