Well Fishman Island isn't really a repeat, but just a wrap up of an incomplete story left over from the Arlong Arc and Sabaody. I'm okay with Fishman Island, apart from how dragged out Hody vs Luffy was and how for now Van Der Decken and the Noah seem totally pointless, although I'm guessing that the Noah will become relevant eventually, a bit like Laboon (hell, maybe Laboon will tow the Noah).
Dressrosa is more of a repeat and while it had occasional bits of what makes One Piece great, the tournament was dragged out and well, really, I watched the anime, so the whole freaking thing was painfully dragged out, although not as bad as most of Punk Hazard aka running on the spot for longer than Ichigo did in the whole of Bleach.
WCI seems like it might've been quite good and I highly doubt the Reverie and Wano will be bad - in fact I fully expect them to be on par with the best pre-skip arcs. Vivi, Zoro and the whole crew are going to shine, along with Kidd and the other supernovas probably.