I disagree. I've had Yahoo reject my emails completely silently (didn't arrive in inbox OR 'spam' folder, even though Yahoo's MX said the message was accepted). Yahoo was entirely unresponsive about this issue. We didn't have the same problem with any other provider and it was resolved immediately upon switching to a third-party email delivery service.

Additionally, Yahoo has a huge amount of abuse and doesn't seem to have an abuse handle either; you have to fill out some form buried deep on their site. On the other hand, I've reported abuse incidents to Hotmail before and have gotten an actual reply from a human (a rarity when submitting abuse reports; most places act on them but don't bother responding).

In terms of being responsive to issues, I've actually had far better response from Microsoft than Yahoo, as I described above. Call the switchboard, ask for the SVP in charge of the division, get transferred directly to him, he picks up the phone on the first ring and talks for ~10 minutes to hear my issue (spam transiting Microsoft's network). Tells me I'll hear from the manager in charge, who calls me 15 minutes later and works over the course of several months (these things do take time) to resolve the issue and improve their systems.

As I wrote above: I'd written Raymie Stata repeatedly after getting a complete runaround from Yahoo's tech support (and diving into dead ends on their website), never hearing a peep from him. Not until I emailed pretty much the entire C-level suite and senior managers with a bit of data showing the nature of the problem (postfix delivery time stats) did I get a return response, from Yahoo's "concierge" service. That finally resolved the particular issue I was dealing with, but that's one appropriate response in years of dealing with the company.

The resolution with Yahoo was essentially the one described in your Serverfault link: get explicitly whitelisted. That's not uncommon with top-tier email service providers.