I suppose one's happiness level with AP comes down to what their expectations are. I sometimes see posts where they expect/equate it to FSD (gulp) or that they simply demand perfection even within the boundary of its limitations. Seems to me that these people are either misinformed or underestimate the complexity of what it takes to make something like this work against actual driving conditions out in the real world at a level that exceeds the average human driver, and simply need to adjust their expectations. I also sometimes see posts where they expect it to be better simply because of the car's price. Well, in case of the overall quality/luxury of the interior and perhaps fit and finish of the car, sure, there are a number of cars in the $80K-$140K price range that set the standard that we can compare Tesla to. But just exactly what other brand at any price range can we compare AP to? It seems to me that Tesla is the standard for AP, at least currently.
The point is, you just have to test AP on your own and develop a feel for where it works, where it doesn't, and where it works but not perfectly smoothly. For me, I have learned to trust to use it 90% of the time, with the remaining 10% being the known limitations and typically "the last mile" (e.g. local roads with poor lane marking or that involve more turns). For that 90% (stop-and-go, highway), it has greatly helped in minimizing the mundanity of my daily commute. The fact that sometimes it's not perfectly dead-center in the lane is a minor issue to me. Heck, it probably does a better job at that than me as I probably simply don't recognize my own flaws just because I'm actually doing it. The car is so fun to drive that I have to remind myself not to use AP from time-to-time even though I know I can fully trust it to do so.