Anecdotally, I played on PC at launch, no mods or fixes and had a pretty good time. The most buggy things I encountered were people clipping into my car when driving and forcing me to hit them. Random stuff, but nothing too bad IMHO, not like game crashes, awful lag/latency, save corruption, etc.
Definitely not bug free, I ran into those often, but I felt like they were mostly trivial. As another concession, I did have an above average rig so I didn’t really fall into any of the terrible optimization problems.