The amount of detail the author took into remaking the campaign is simply insane. From the cutscenes, the boomer spawns, the overall map layout, and the dynamic world is simply... insane.
Though I will admit, there were some things I didn't like. Voice acting was kind of funny, and bots seemed to get stuck in certain areas (usually next to a table, a ladder). But the author took advantage of his voice acting and the survivor lines to create a unique conversation that I otherwise haven't seen in any map I've played.
Even if you're not a fan of Dead Island, or haven't played the game, please, download this campaign. Even the finale alone is worth downloading it, which I won't spoil.
The campaign itself is a creative combination of several valve maps, including No Mercy, Death Toll, and Blood Harvest (though not a direct one!). The campaign is very open, so there's lots of places to explore, and paths to find. It is a rather challenging map, but not too difficult to a point where completion is impossible.
I would like to point out, however, that it is difficult to distinguish the gauntlet events from regular panic events, so I ended up fighting hordes of zombies for 5 minutes before realizing they were infinite (may I suggest adding a "run to the safehouse" director event to display on the screen?). There were a couple nav issues going on in the finale map where bots simply stayed in an area until an infected killed them, or you decide to stay with them.
There were some funny moments, having a curious mind ends up killing you when a train runs you over. I really enjoyed the campaign, in the end, and would definitely play it again.