We'll I haven't seen a bug free game yet.
BF4 - unplayable at release, still has serious issues 1.5 years later
Driveclub - online didn't work for months
GTA Online - constant crashing, character deletes, next gen servers very unstable at launch
Advanced Warfare - quick reload bug, map exploits, game not downloading all the way, losing emblems
Rocket League (best game on ps4 no question about it) - crashes mid-game
Planetside 2 - if you think pCars crashes a lot then don't attempt to play this, different language menus
Hardline - horrible net code and match making
Project CARS is no different.
Publishers/distributors and fans all want game development to be faster and faster. This is what happens when you get what you ask for. Everyone complained about delays and now everyone complains about bugs. If they would of released a bug free game there would be more delay and more complaining about delays. So pick the lesser of the two evils.