Kareem IMO was the most "unstoppable player" just because of the obvious. If anyone ever again perfects a shot that cannot be blocked... and makes it so damn often... then that's an NBA title contender right off the bat. What a team player too... god he was truly a perfect basketball player.
MJ was probably the best all-around player. I think Lebron is honestly a more talented player than MJ, but MJ played smarter. MJ had the heart and the greatest coach of all time for support, whereas Lebron kinda just has himself and tries to take everything on solo... and clearly it acquires less rings ;(
Bill Russel, Wilt, Kareem, Hakeem. I think those 4 were all the best big men in their own way, however I do think in a straight up type of game, Shaq in his prime was > their primes.
The best shooter of all time is Larry Bird (just under 49.6% for his career) and many were from range. Jordan was 49.7%, but that included many closer shots, so really Bird had better accuracy considering where he'd pull up. Kareem is much better with 55.9% shooting, but in comes that whole "unstoppable shot" thing so some people discount his shot % due to that even if technically he was by far the best shot %.
Bird was also the king of following his shot. I challenge anyone to see which shooter followed his own shot and got the offensive rebound more than Bird. I really don't think there is one. Michael was close, but not nearly as much. This statistic is also the reason I completely hate Kobe, because he ASSUMES his greatness, and never follows his shot... plus he also is almost 5% FG under Bird and Michael, and also has less stats in almost every single other aspect of the game compared to them. Whenever someone mentions Kobe as a "great," I just want to slap the shit out of them 1000 times. He deserves to be called "a good player" and that's it.
Most powerful and intimidating player of all time...... this is a toss up between Shaq and Wilt, and I don't think I need to discuss why. Shaq of course was much more powerful than Wilt, but in their respective times, Wilt was just as powerful compared to his opponents as Shaq was...... but it's just the times were different. This aspect of basketball has changed probably the most, so it's very very difficult to compare different generations on this topic.
There's a lot more, but my counter-strike queue popped. Later!