The reason Tesla is doing so good currently is because of a simple thing:

They have the best implementation of EV's currently:

Long Range
Performance
Durability of Battery
Vehicle Infotainment system that understands that it's an EV (auto routing to find chargers for road trips)
Charger Network
Looks somewhat sexy, both inside and outside. (with one disclaimer, see below)

Fit and finish on Model 3's that I've seen up close in the DC area are OK -- nothing to write home about, but not terrible either.

BUT

1.) Tesla has really weird user interface ideas from time to time.

They nailed it mostly with the Model S -- the right amount of buttons, the right amount of LCD screens:



But the Model 3 is all kinds of WTF:



I don't want to look at a damn tablet that looks like it's been bolted on to the interior. Where's my dashboard in front of me with vehicle status (speed, range to dead, % of motor power being used) so all I have to do is look down?

2.)  Long term parts maintenance record of Tesla is well; spotty.

The Tesla Roadster, Generation 1 (2008-2012) is now out of support with no spares manufactured for it, even though it's only 11 years old.

You have to go to a specialist garage in WA to get service.

https://www.cnbc.com/2019/08/24/tesla-roadster-repairs-medlock-sons-in-seattle.html

Also; Tesla is notorious for changing a design suddenly through production cycles -- this happens with other MFGs from time to time if a problem is serious enough -- Ford had to revise the 5.4 Triton V-8 spark plugs and did multiple changes to the 6.0L diesel to try and keep it from grenading.

It's not a problem if it's documented well enough, and spares are plentiful; something Tesla isn't known for.

Let's look at the other EV/PHEV manufacturers.

All of them were halfbaked.

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FORD's entry -- the Fusion Energi PHEV was at first glance; decent.

Lots of interior room.
A decent infotainment/nav system.
20~ mile range on battery; enough for a lot of people's commute or going to the store.
7 hour charge rate at 110V; 2.5 hrs at 220V

BUT...the battery was in the trunk; with an air cooling system (a little fan).

Air cooling a battery kills it, look at the Nissan Leaf fiasco.

You need liquid cooling for long term durability of batteries.

Plus, Ford cancelled it for more Trucks and SUVs.

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Chevrolet/GM had a decent first glance lineup in the Chevy Volt PHEV and Bolt EV.

Both vehicles had liquid cooling, making their batteries as rugged as Tesla; with some examples lasting to a very long time.
Both vehicles had a decent infotainment system.
Range on both was decent (40 to 60 miles depending on Volt Generation and 200~ miles in the Bolt)

BUT....BUT....

GM fucked up by making the Volt be based on a compact sedan (Cruze Platform) instead of the Impala.

Likewise, they made the Bolt the electric version of a subcompact econo-shitbox.

If I'm paying 30-40K for a car, I want legroom and headroom as a 6+ foot man. The Volt has so little headroom that I can try lowering the seat all the way, and my head is still almost touching the roof -- not good for 2 hour drives.

Likewise, I'm not paying nearly 40K for something the size of an econoshitbox (Bolt).

Meanwhile in other manufacturers:

The Mitsubishi Outlander PHEV has 40 miles of range on battery BUT:

It uses an aircooled battery -- a simple blower in the battery case; plus an air conditioner cut in if it gets hot enough.

Plus, the inside is like someone vomited out something from the late 1990s to early 2000s:



Honda's Clarity PHEV has a liquid cooled battery pack and has range somewhat equivalent to the Volt; but the outside looks like shit and the inside also has a minor Mitsubishi problem.



Plus Honda shipped their entire Clarity PHEV output to California...

Plug in Hybrids are clearly the future -- if you get a battery big enough for about 40 miles, you can cover 75% of almost everyone's daily drive; and it's small enough to charge from even a 120V outlet in reasonable time -- the Volt can charge in 13 hours from 120V.

The gas engine can meanwhile be optimized for maximum efficiency -- the Fusion Energi PHEV once you exhaust the battery in silent drive mode, goes to about 40/40 city/highway MPG

Nobody's really put everything into a working package that hits everything -- at this point, they're vanity purchases if you have $$$ to blow (especially the Teslas).

I've always heard, besides acceleration and a giant touch screen, Teslas were pretty boring with cheap interiors. Would you really compare them to a BMW or Audi?

Who said anything about them being unreliable?