To me, the Shark jumps after one of the best episodes "Nine Dragons" because once you pulled all the stops of having Wo Fat go that far in his schemes, you could *never* use the character again like in the past. Not unless you topped the stakes of "Nine Dragons" which would have been impossible. So to me, there is something of a sense that an era is over after that episode because you know he's not going to pop up again with the same once a year regularity (the last episode of course failed to do justice to what the real final confrontation between him and McGarrett would have been). And then by Season 10 with no more Che, Doc and Jenny to lend more of that great ensemble quality the episodes lose something even more. I can find enjoyable episodes here and there, but I seldom feel like binge watching Season 10-11-12.