I believe Yahoo! definitely had 'culture' in the early days, they were pretty much synonymous with end-user content on the net and the Y! employees and their users were the ones that showed us cool offices, a different kind of company and neat things to do with the web. I think they went downhill since the .com crash and never managed to recover. The final remnants of that were buried in the last two years, now Yahoo! reminds me of an oiltanker with the captain and the rest of the crew below decks. Time will tell if they can turn it around or not but with giants this size even dying will take a long long time.
To answer your question, though, I started three years ago and some months ago. I came in just a bit before the Microsoft deal fell through.
I keed, I keed about the bathing. :-)
Sorry, but what culture do you believe Bartz destroyed? I was at Yahoo before Bartz, and left only about a month before she was fired. I don't believe that Bartz destroyed anything. Yahoo has never had a great culture. They've always had an identity crisis. You can go read PG's older essays and see that.
Bartz was fired because she couldn't work a miracle. Yahoo needs some truly amazing changes in order to avoid Sun's fate, and I'm not sure anyone out there can/will deliver what's needed quickly enough. You mentioned Apple as a turnaround example. Exactly where do you think Yahoo is going to get a Steve Jobs?