Watch this if you're tired of seeing boring repetitive tropes and stereotypes in anime instead of characters. On the contrary, if what you're looking for is fanservice and shallow tropes, move along. Brand new newcomers to the franchise will likely be confused, so if you're new keep that in mind.
Keep in mind that this anime is basically an arc full of reveals, rather than a self-contained arc of its own with clear start and clear finish. What it brings to the table are its characters and character development, interesting flashbacks and some humor. But don't expect a story that begins in this arc and ends in this arc. Well, there is a story like that in this anime (the whole plot, you know?), but on its own it's nothing mind-blowing. The reason for this is that the plot of this anime is basically just a reveal, too, but I can say no more without spoiling it.
I can't say whether it's bad or good, but there's an overarching story in the manga that unravels horribly, horribly slowly throughout all the arcs, and the Atlantic arc is basically a heavy dosage of reveals dealing with this overarching story directly. I've found it enjoyable on its own, though, both in the manga and right now in the anime, as it's very well-done, has a lot of humor in it and fleshes out a lot of characters.
