The thing I liked most about Spider-Island was the structure of it. Most events I read feel pretty padded out for ideas, or don't really utilize the ideas they have properly. The first issue, 666, is really good, cuz it just sets up everything. Peter Parker, who he is, what he does as Spider-Man, the Avengers, the FF, Norah/Phil, PeterxCarlie, Flash as Venom and his relationship with Betty, Jonah as mayor, people getting spider powers, Jackal and his deal, who the fuck is this Spider-King guy, who the fuck is this woman behind all this, Madme Web and her prediction that Peter Parker will have to kill someone, Mary Jane. Pretty much all the major players get touched upon and introduced, and I think Slott did a great job balancing and building the various plots while never losing track of Peter Parker as the star of all this. The stakes keep raising throughout, and the final two issues are extremely satisfying, with a lot of various payoffs and new beginnings for several characters.
And Ramos, I change my opinion on all the time, but I find his kinetic wacky style well-suited for Spider-Island, and Edgar Delgado does some fantastic color work throughout.