I personally enjoy Dead Island more right now because of the combat system and the hours and hours worth of content, but it contains minor glitches.(some are funny though) Left 4 Dead is a great multiplayer game and that is what I compare between them. L4D has an always fun MP mode but tends to be one sided most of the time. Its fun when your not on the receiving end of things. Dead Island is great because of co-op, and weapons. I enjoy beating zombies heads in with a paddle. Something that cannot be obtained in L4D.