Betrayed by the ending

[Dr. Wily III]

Megaman 4 is my top candidate.

Gunstar Future Heroes ending on easy also was terrible.
Hotel Dusk, "What the fuck? What the hell are you doing now, huh???"

 

[esperandote]

silent hill 4,3 and origins, i havent played homecoming but i've seen the endings and they are awful too.

 

[Siris]

Killer7's WTF? Endings