Amnesia: The Dark Descent

None, hud is centered, it is worth mentioning that on the main menu the menu items are on the right monitor, but this may be a design choice, not a flaw.
Only real hud in this game is the inventory, which is centered properly.
Only in-game cutscenes, rendered properly at all resolutions
I'm afraid we have some "inverted stretching" going on on 2D screens... Although the inventory looks ok in all ARs, proportions are not maintained.