The factory Yamaha bikes mustered not a single podium between them the year before he joined and won the championship against the all conquering RCV-V5 but, it was quick and competitive before Rossi ever saw it?
Your normal tainted response and refusal to apply any objectivity. Same old crap, blaming 'Stoneritis' for daring to question wildly exagerrated claims about what Rossi did. What's it got to do with Stoner - it's you who has the ingrained problems sunshine. You mention him in nearly every comment.
There is no argument that the 2003 bike wasn't that good. There is also no argument that they didn't have a regular race winner on it either, so good results were always going to be difficult. One of the alledged problems was the fierce power delivery of the engine - Barros suggested a softer version.
The 2004 bike, as you well know, was designed afresh by Furusawa - you know the score - before Rossi. Rossi broke his own lap record on it. The bike was good straight from the box. Rossi never rode the 2003 bike and offered a direction for Furusawa to follow and produce the 04 bike - he was already there. You know this. Are you going to say he developed the 500 Honda as well - as has been suggested - the bike that had won 6 straight titles when he got on it.
His time at Ducati has shown him to be on the same level as any other top drawer racer, not 1 second a lap above it as was so often claimed and someone who looks quite ordinary when a bike doesn't suit him - certainly not 1 second a lap faster than a team mate on equal equipment. It's also showed he is no more able to adapt to and overcome the shortcomings of a problem bike than any of the others, except one, so that myth is busted too.
What he gave to Yamaha was a rider who was fast enoough to make the best use of a good bike. He was a better rider than Biaggi, who did and still does make too many mistakes. Gibernau was almost there but not quite - who else was there? Barros was not on the same level but actually beat Rossi a few times when Honda let him have a V5 at the end of the season
A good rider on a good bike - of course he was able to win in 2004. No argument. Just don't perpetuate the crap about the M1 being good because of his direction. It was already where it was when he got on it.