Jordan was great because he reinvented the game(combining showmanship with competitiveness, something we see from predecessors like Bryant, James and many of the young players today), he was super clutch, and actually a pretty good defender although scoring wise he wasn't as prolific as Bryan. The guy redefined the slam dunk with foot work and dribbling skills that looked like something from a video game. I will say Kobe was pretty special too, but what put him a little higher was the fact that his play didn't stop on the offensive side of the court.
As far as the NFL, it's all about championships and the QB. In baseball, it's all about stats. Basketball, stats combined with championships and positions don't matter so much, although point guard is usually the key position, granted players like Lebron James and Magic Johnson tend to disagree.
Speaking of the QB position being overrated, JJ Watt pretty much broke every defensive record possible not long ago and still couldn't beat a QB in Aaron Rogers for MVP voting, having a season that was overshadowed multiple times in the last decade.