Earlier quoted context omitted.
Agreed. Housing, where location is easily the most important factor, is where Craigslist is least usable as a product. Padmapper's success is a testament to Craigslist's users wanting something better. This is a big middle finger to all those users.
I agree with you, but if PadMapper is really that much better, what's stopping them from getting users to post directly on their site?
eBay, for example, hasn't changed its (rather mediocre) interface in years, and managed to alienate at least some sellers with their policies. And yet, no one managed to make a dent in eBay's position.
Network effect is the reason there is funding for a million social network start-ups. Everyone wants to capture it. But the odds of success, on the other hand, are also one in a million.
I believe there was a post recently on HN where someone pointed out how these things work - one day it just takes off. Some combination of factors (three out of 100, perhaps) gets right and people flock to the site. And then the fate is sealed. Even in retrospect it's often impossible to say what factors were the key. So, I wouldn't be surprised if founders of Craigslist have little clue as to why it worked.
I'd be really really interested to see what it takes for someone to unseat Craigslist (or eBay, or any other major network).