Seriously there are like 20 people posting the same bullcrap on every page...
I feel as if island maps haven't been given a fair chance by mapmakers/players, perhaps largely due to the legacy of island maps in Brood War. Island maps would make for some very different gameplay, but I'm not convinced they would necessarily be imbalanced, as each race as certain advantages it can bring to the table.
-Warp-ins and Warp Prisms are very strong on islands, allowing reinforcements where your ground forces can't reach and harassment where the enemy army can't reach
-If the islands are close enough, blink Stalkers would be very effective and mobile
-Protoss air could be pretty viable in all matchups if you don't have to worry about dying to early rushes
-Mass Recall would be very good on island maps
-Drop play would obviously be very powerful
-Terrans have very powerful air superiority units like the Viking and the Raven, and very powerful Air to Ground units like the Banshee and Battlecruiser
-Terrans can float their buildings to other islands (you could design the map so that you can't take expansions too easily though)
-Turrets are ridiculously powerful
-Has the easiest time doing massive drop play
-Queens are pretty much the best early game anti-air, and Spores are always quite powerful and very mobile
-Nydus worms allows transporting entire armies between islands
-Can build a godlike economy if they don't have to worry about early rushes
Obviously this isn't a complete list, but with all these different advantages I have a hard time telling which race would be strongest on an island map.
Of course, "island map" is just a catch-all term that could refer to all kinds of different things. You could have a map that starts of with players isolated from each other but with rocks that can be killed (I guess sort of like the Novice maps), or have straight up island maps with only main + natural on your starting island and then a main "continent" in the middle, or even have a map that starts off pretty regular but with bridges that can be destroyed to turn it into an island map (Battle Royale style, not sure if possible on a Melee map in SC2).
So, what do you guys think? What is the reason that island maps haven't been explored much? Would they be too imbalanced, and if so in who's favor? What are some things that could be done to mitigate that imbalance, or is it even worth exploring at all?