Profanity: Left 4 Dead and Dead Island are completely different genres, they just both happen to have zombies in them. I tried Dead Island for a bit on my friend's PC and I dunno... It just didn't hook me and I turned it off 5 minutes after the tutorial phase.
dyscode: Yes, I just read several times now that DI compares more to 'Borderlands with Zombies'. So since I have already Borderlands this is even less am incent to get it.
I'd say that Dead Island is comparable to Borderlands in that it gets repetitive solo, but on multiplayer it is a blast.
Then again dunno, rented dead island and had fun in the first area, did not try multi, while I loved Borderlands both solo and on multiplayer.