I think the quality difference between naruto/bleach compare to One Piece anime stem from the way the mangaka tell their story more than anything else.
Both Kishi and Kubo have a horrible habit of wasting a lot of pages. You can find evidence of this by reading the earlier chapters of bleach and naruto then compare them to their anime counterpart. What you will often see is that a lot of good naruto and bleach episodes usually consist of 3-4 chapters of content, granted kubo is the worse of the two since this fact become blatantly obvious during the soul society arc. This is also pretty obvious in the earlier episodes of shippuuden since they were dislike by many peoples because the anime studio was trying to limit them to 1-2 chapters per episode.
Oda on the other hand seems to be able to keep his chapters consistent in term of both quality and quantity. Many of the recent One Piece episodes start with a 5 minutes intro and limit themselves to 1 or 2 chapters max, yet they still somehow manages to be interesting and entertaining judging from the responses of the One Piece viewers.