I agree. I can't say much as I've not seen it, but I don't really like it when series just continues on because they can, to just keep making money. I can't even stand to watch Naruto. Everytime I see it, all I can see is their pathetic attempts to stretch out what they're writing with writing as little as possible. Half the characters have their mouths covered so that there's no need to draw their mouths moving while they speak and the scene slowly zooms out over 1 image. They have repeating images that go on for quite some time say when jumping through trees and so on. It's terrible.
One piece does have a lot of fans but again just seems like something that's fun to watch if you're into it, not something that has a really interesting story that draws you in from start to finish.
If I'm to watch a series, generally I watch it for the entire story, from start to finish, and want to be amazed by it. Obviously that's a difficult task if you're making it up as you go along for the sole reason of dragging it on. For example, I thought Gundam was some random, boring robot fighting anime, but when I saw gundam SEED, I was blown away that it had such a deep story. The gundams themselves meant pretty much nothing to me (other than a means to write the story), I watched that for its story and it was amazing.
That's just me though.