You must be a young lad with your all-time list
Best in game dunker all-time....Dominique Wilkins in his prime http://www.youtube.com/watch?v=tyUf-9ruJi8
...not even close...Shawn Kemp a close second http://www.youtube.com/watch?v=HQeMhYJe5JA
check out number 5. Only time in NBA history a player has shook another players hand out of respect after getting dunked on. Those two guys had grace, elegance, showmanship and most importantly because of there size had what MJ was missing, raw power and aggression.
Best dunker all-time though. Taking into account dunk contest AND in game dunks. Vince.