Overall I've been impressed with FSDb driving execution. Not perfect, but not bad As many have said, like riding with a teenager. The only real execution problems I've seen are some hesitation stops in explicable places, where I had to use the pedal to force it through because it wanted to just park in the middle of the road.
Most of the major frustrations I've seen on my drives all come down to one core issue: very poor lane choices. It fails to think ahead about lanes in traffic at all, and/or fails to realize which are turn lanes until it's too late.
As a human, I will get into the right-most lane when able because I have a right turn coming up a mile down the road, because it avoids having to fight your way into a populated lane at the last second later. FSDb really fails at this kind of thinking.
In my worst example, nav was on a feeder road going to turn left under a freeway bridge. It stayed in the right-most lane until the last possible moment, then made a double lane change all the way left into a U-turn lane, then re-corrected back right one lane into the correct left turn lane. There was no traffic so I let it play out, and it did eventually make its turn with no intervention, but the path through the lanes to get there was insane and totally unnecessary. All lane markings were crystal clear and visualized, and backed up by signage. It could have in the correct lane half a mile earlier and needed none of those moves.
Still, color me very impressed with the progress to date, and hopeful for the future