I don't see how the trailer was misleading. It depicts a family in the hotel at the resort being overwhelmed and killed by zombies. I am not sure what kind of game someone might think the trailer was for other than one that... uh... that has a zombie outbreak taking place at a resort... which incidentally, is the premise of Dead Island.
I agree doubleKO, the sewers were kind of a drag. They were kind of hard and felt like they went on forever while being considerably less visually interesting than much of the rest of the game. I suppose they were a means to provide variety, but I always dreaded them. If you've only made it that far in the game, my goodness! Pick that sucker back up, it get much better!
It isn't just melee, there are a lot of guns in the game once you get about halfway through. If you are only at the first sewer, then you haven't even made it that far. I really liked the dynamic of having firefights with uninfected gangs, it really adds a lot to the game. Even if Dead Island got a few things wrong and wasn't as polished or expansive as it could have been, it was very much heading in the right direction on most things.