Game saves issues is the big one. you can google it. They have experience 20% of games sold returned already. They don’t know why its happening and their attempt to fix it just screwed up more shit (resetting in-progess trophies and xp challenges). Theres a list of minor stuff such as freezing issues, framerate issues, and some gameplay stuff such as weapons switching themselves.
some issues are their.
http://www.dead-island.com/forums/dead-island-game-support/2251-auto-save-issues.html