Little or no interaction or conversation with characters. I have no interest in Myst or the inumerable clones. I like conversations. I like showing everything in my inventory to characters and getting a funny response.
I like sudden, strange deaths, but then I started adventuring with Sierra's Space Quests. So walking around a jungle maze in which absolutely nothing happening, in Beyond Atlantis had me bored almost to tears.
Action and timed sequences don't bore me, they make me angry.
Adventure Game: Broken Age
Casual: Redemption Cemetery: One Foot In The Grave
Darkside: The Witcher