Let me start with this: in the time period in which he played, Michael Jordan was about as dominant as anyone has ever been.
That said, through no fault of his own, I think the time period he played in should call into question whether he's the all time greatest player or not.
Why?
Of the very greatest players of all time, none were in their prime during Jordan's era.
Just ask anyone to rattle of their top 10 players of all time. You'll probably get something like Russell, Chamberlain, Robertson, Jabbar, Magic, Bird, Jordan, Shaq, Kobe, and Duncan.
The issue is this: none were in their prime when Jordan was winning championships. MJ caught Bird and Magic on their way out and Shaq hadn't matured into the dominant figure he'd become until MJ hung them up (well, the second time).
So what does it all mean? Well, how many titles would Bird have won if he had played in the '90s and didn't have to contend with Magic's Lakers? How many titles would Jordan have won, had he had to go toe to toe with Bird just to get out of the Eastern Conference (as Dr. J. had to each year)?
I'm sure Jordan would have done quite well in any era he played in and he may indeed be the greatest ever. But I think that if had been forced to play in an era with another historical great he would have not stood out quite as much as he did and the debate wouldn't be quite as black and white as many people see it.