(Feel free to post your own list... I agree with Techtite on youtube on this list.)
10: Infidel (You die in the tomb)
9: Halo 2 (There was no ending)
8: Diablo (Stabbing your head with a rock)
7: Agent 13 (You find out who tried to kill you, but he stands next to you... And you die.)
6: Light and darkness (The ending makes you go "Huh?!")
5: The 11th hour (3 endings, all bad. Save your girlfriend, you die. Save girl 2, you escape, but your girlfriend dies. Girl 3, and she tells you she's a ghost, and you're trapped forever)
4: Quest for glory III (All your acts of heroism from I and II never happened.)
3: Clandestiny (Your character is a LOOOOOSER and your castle explodes, your GF dies.)
2: Darkseed 2 (You're framed for a murder, and then you're killed by the villan, then the police think you killed yourself. The villan drives off, laughing)
1: Phantasmagoria (You have to kill your husband to live, and then his evil spirit comes, and you easily kill the spirit. Why didn't you do that sooner, and you both live?)
There you have it.