It's kind of like the Titanic, except that it didn't sink (though it never really got off the ground). Everyone loves it even if they don't know why.
On the other hand, I do know why:
Just from a layman's stand point, that #2 looks a hell of a lot more secure than a DC-10's suspended up in the tail.
It's got the largest windsheild out there, and the view is delicious - and the cockpit is huge. It's technology, by virtue of excellent design alone or in combination with the fact that it was designed by a company not inclined to build commercial jets, was so advanced that it was too much for Lockheed to handle. In the end, it cost more to build than they could sell it for.
Ah yes - the lounge below decks, well, you won't see that anymore (argh!), and the DLC (I had a pilot of one of Delta's explain that to me on a tour!) is a magnificent concept, even for today. The engines, I hear, were very advanced for their time, which made them hard to handle both in terms of production and maintenence.
The big kicker with the L-1011 is that it was made at almost exactly the same time as the DC-10, and if it hadn't been for a lot of random factors, American would probably have ordered it instead of a half a fleet of -10s. But the -10 got there first (in my opinion, unfortunately).
Ultimately, it's the perfect aircraft. If you want it - it's got it. Range, capacity, comfort, quietness, technology, autopilot, luxury, hell - it apparently even has sex appeal.
I think to an airliner fan, the L-1011 is the goddess, distant, removed, hard to understand - but beautiful and powerful and good.