I think some of them are just so far removed from the DF logic we've followed closely and seen evolve, which is Luffy's. Not that there aren't a bunch of insane logic leaps (it's a shonen) involving other DF powers, but Doffy really takes the cake. I can make the connection to Parasite well enough, it takes a leap of logic to connect the power of creating/manipulating string to the actual ability to control people, but it makes sense thematically; he's a puppet master. His ability to stitch himself up makes sense and his attacks all make sense, but when it comes to the string clones and the birdcage in particular? Come on. That stuff is ridiculous. Not only can he create an exact and believable clone from string, but it can talk? And the birdcage just bugs me on a bunch of levels..he has created this MASSIVE thing, big enough to cover an entire island, that is not only (apparently) indestructible, but he doesn't need to even think about it and it continues unabated while he's absolutely at his limits. If he had made it and it became a separate thing that went beyond his control, that would almost make more sense, but we've seen he's in total control of it and that just seems like too much.
It doesn't really bother me, but it does cheapen some parts of the story to me right now. I always loved that One Piece has its own insane form of logic and a couple of Doffy's (and Law's) powers have been the first things to really pull me out of the world more than I'd like.
I blame all this on the Time speak..somehow people forgot how insane DFs are a lot of the ones we saw were low calibre fruits used to most of their potential. So people were not ready for Laws fruit in the hands of a supernova and how insane it would be. Rubber is already insane. DD is a true master of his fruit and he has been able to draw out its reality vending powers to the limit. Plus I'm betting he knows what Devil fruits are.
Oda had preparer us for this insanity. I still see the logic but it seems a lot of others forgot.
–- Update From New Post Merge ---
oh believe me I understand. I wouldn't mind characters not getting a chance to shine. I would LOVE for there to be an arc where Luffy and Zoro are not a part of it. Nami, Brook, and Chopper desperately need attention. I am hoping that after this arc is over, the next one will just be about the Swirley hats. Luffy can use a breather lol
I don't think I can read One piece without Luffy for so long. For me he's the one character who makes it work always.