After watching the previews, it doesn't seem nearly as glitchy as other Techland games at launch.
Things they need to fix in a day 1 patch:
1. Tapping spacebar (jump) opens a chat box, even when playing solo.
2. You drop your equipped weapon when your inventory is full and you try to pick up a new weapon. This can be pretty subtle, I've seen a lot of streamers toss their best weapon without realizing it.
3. Zombies falling through the ground, especially after falling off something else (car, building, etc).
Unless I'm missing something, that's about it. Still, Dead Island's biggest disaster on launch involved the frequent loss of save data, which is a problem we wouldn't know about before Tuesday.