So HSDK's ending...I'd give it a C I guess. It went with the standard boring, here's where everyone is and we're going to have everyone gather for a party (although they never show the party) setup. That set up is fine, but not exactly exciting. I'm not going to say it is a failure of an ending though because it does manage to have both of the main characters fulfill their dreams. It wasn't bad, but it wasn't good. Have to wonder why the series is ending now, I mean we didn't get a long arc dedicated to Kensei, which I was expecting since he was the villain behind everything and I can't even remember what the hell happened to him in the final arc.
All of these shounen manga ending in unsatisfying manners only reminds me that One Piece is the best. Right now they're in an encounter against a villain teased over ten years ago. When Brook joined they brought up a story payoff that was also about 8-10 old. There's a story that's had some ****ing PLANNING.
The planning in One Piece is amazing. There are so many plot threads that you can see slowly built up over the years in the background of the main plots. Blackbeard for example was the major background plot of the first half of the Grand Line where he's first mentioned in Drum Island and we learn someone is after him and Luffy, then we learn that Luffy's brother was the one looking for them on Alibasta, then we see Blackbeard in Jaya(might be getting that name wrong) where he wants to go after the Straw Hats but is prevented from it by luck, then during the end of Water 7 Ace and Blackbeard fight, and these events lead directly into the War of the Paramount ending the first half of the Grand Line story segment. And I know that summary misses some of the events. From start to end, that plotline lasts something like 45 volumes. That means we're talking more than 450 chapters which is something like 9 years, and arguably it is still ongoing since Blackbeard is now a major player in the world. I am greatly looking forward to the events of Reverie which seem like it will be the conclusion to the second half of the Grand Line (and possibly the series itself, although that is likely still a decade away). There are two things Oda excels at. 1. Giving his characters weird powers that make for interesting battles and 2. World building, oh god does he excel at world building.