I really enjoyed this series so much although I thought it ended prematurely. The last chapter just felt so rushed in my opinion. If it were up to me, I would've went on with Shohoku beating Aiwa, moving a bracket up and facing Kainan once again in the Semi finals (if possible) and finally defeating them. They don't necessarily have to be the National Champions, just winning a rematch with Kainan until getting ultimately beaten in the Finals, would've sufficed. That would've been the ideal ending for me.
But even though I yearn for a more detailed grand ending, I thought it's still brilliant to end the series in that arc. Just when an irreplaceable member of the team is about to depart. All in all, Slam Dunk in its entirety has been awesome and the illustrations were great. It's one of the few series that I'll never get tired of reading/ watching over and over again.