I'm gonna edit this in a second…
Captain Brooke - Franky has been on the crew for a week tops... Keep in mind they were on Thriller Bark for only 2 (possibly 3, but I'm almost positive 2) days, and the trip off Thriller Bark was less than a day, and then the trip from W7 to Thriller Bark was basically 3-5 days... maybe even less... There's no way he's been there for multiple weeks.
Miracles... One, you are right, that he never said he would want Fishman Island at chapter 500, but given the time setting, it seems like it could fit in the time frame, snugly and not too rushed.
Also... What the HELL are you talking about? This is not just a typical rescue arc...
I mean seriously come on dude...
They are going to rescue someone they're not sure who they are, the person is actually one of their enemies, they are going up against someone who've they've met previously in the series, they have two new characters sided with them, a series of new villains with new designs, people actually making a difference that were in cover stories (Makuro Gang, Camie, Pappag) oh yeah, and in the end they get to go to Fishman Island (how's that for a reward, after a most likely awesome arc)!
Oh I forgot, its been only 1 chapter and 2 pages so far into the arc, and not only is it this awesome already, but you are judging it by its cover (which in basically the entire community's oppinion looks fun and enjoyable so far).
You are the only one bitching and being pessimistic over this... I'm honestly extremely surprised that you can't see even a glimmer of the usual One Piece goodness in this arc.