For me it's not the promises that didn't come true, but that the execution of the promised features wasn't really that good on some elements of it.
TACC = Exceeds expectations. Absolutely fantastic smoothness in Firmware 8.0. This is why my Tesla is the road trip car
AEB = Below expectations. Had some major holes that even a lowly Subaru system doesn't have. Was fixed partially in 8.0, and I expect a system that exceeds expectations with 8.1
Lane-Steering = Meets expectations. Has some glitches like trust luck, and losing the lane while cresting a hill. For a first-generation crack at it I'm happy
Sign reading and speed management based on signs = Far below expectations. Reads them wrong all the time especially in Oregon.
AutoPark = Below expectations, and relies on ultrasonic sensors which fall short of what's really needed.
Summons = Meets expectations, but the expectations were low with this one. It's just straight in and straight out. Gimmicky feature for a lot, but I like it.
Side Monitoring = Far below expectations. By far the crappiest blind spot monitoring system I've ever used.
Delivery of promised features = Other people were upset by how long it took, but on par with my own expectations. if there was a promised date I didn't see it.
Overall impressions = Tesla ended up exceeding the capabilities of the hardware so it fell short of expectations. It was understandable due to the sensor technology in place. I feel as if AP 2.0 has the technology to far exceed what we have now, but not for L5. So once again they're over promising before they really know what obstacles they're going to face. It doesn't have to be seen as a bad thing. They make lofty goal, and sometimes its better to have tried and failed. I'll continue to ride this interesting ride.