The best replacement for dead island is dead island riptide.

The best alternatives to dead island are rated as following:
★★★★★  dead island riptide
★★★★★  dead rising
★★★★  left 4 dead
★★★  dead rising 2
★★★  far cry 3
★★★  borderlands
★★  state of decay
★  riptide
★  dead rising 3
★  borderlands 2
★  dayz
★  left for dead 2
  resident evil 6
  left 4 dead 2
  dying light
  far cry
  resident evil
  left for dead

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Speaking about dead island, one probably shouldn't forget about tunngle.

Other search terms related to dead island and their ratings are:
★★★★★ tunngle
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dead island
dead island riptide
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