wins 60% of the championships in a decade. During the 90s, the bulls were champions six of the seven seasons that Jordan was actually playing with them.
Jordan took a two year "break" in 94 and 95 and was "retired" by 99.
The bulls probably would have won in 90 if they had gotten past Detroit. Regardless, of the four years (90, 94, 95, and 99) that the Bulls didn't win it all Jordan wasn't on the team for three of them.
All that being said, no team is unbeatable. The Jordan mythos, however, is pretty deserved. I, personally, would put money on the Bulls against any team from any time period.
The guy was good enough that he could and would clown people during playoff games (yeah, Jordan isn't a great guy character wise).
I'll get back to you when we perfect cloning and can make these retro match ups happen. I'm pretty sure we'll still be bitching about or exulting in Michigan sports in 2077.
(Okay, I spent waaaay too much time writing all that. Back to work).
Edit: oh and I see way more "Jordan carried a team of invalids" claims than I do "the Bulls were a collection of the best players ever" claims. Jordan played on some really good teams.