I can count plenty of incredibly ambitious announcements from them that have turned out amazing! In fact, they are an outlier in how many they have challenges they have taken on and succeeded in.

[x] Partially reusable rocket that dropped cost to orbit by an order of magnitude. And no, the space shuttle (while an amazing piece of engineering), doesn't really count. It cost a billion+ to refurbish and did nothing to make space more accessible. Now we have businesses that exist purely because the Falcon 9 exists. Heck, the entire new space industry got validated (and hence got investment) due to SpaceX's success.

[x] Returning human spaceflight capability to the US at a fraction of the price, using the same reusable rocket platform after the old defense primes failed to do so. And then making it cheap enough that it has now also flown about half as many private missions as it did for NASA.

[x] Global satellite constellation providing gigabit-scale internet with 10000+ satellite (once written off by "experts" as yet another "incredibly ambitious project" that will never happen).

[x] Commercializing and bringing down the cost of electric cars to the point where they are actually a viable option now (unlike the compliance cars made by OEMs 10 years ago).

[x] Building the largest rocket to ever exist that now has a clear path to being the first ever fully reusable launch vehicle.

[x] A BCI implant that has now brought back mobility and communication ability to multiple patients with debilitating conditions.

Given that each of these were things that no one had done successfully before, or had failed spectacularly - I don't really care that they took longer than initially planned.

There is, in fact, a graveyard here. It is mostly filled with confident predictions that his companies would never do the things they have since done.