Call of Duty 4
Half-Life 2: Episode 2
Also the ending to Assassin's Creed II, while not an outright tear-jerker, just seemed extremely unfair after all that Ezio had gone through to get there, and that ***** couldn't even be bothered to answer a few questions for him.
When Sgt. Jackson gets nuked, and the end, where Griggs is shot while trying to pull you to safety and Gaz is executed by Zakhaev while all you can do is lie there helpless and watch.
Half-Life 2: Episode 2
Eli's death, obviously, and a bit in the antlion tunnels where you come across a dead body sitting in a chair with blood on the wall behind his head and a shotgun by his hand, with the obvious implication being that he had been the sole survivor of whatever it was that had happened in the previous room.
Also the ending to Assassin's Creed II, while not an outright tear-jerker, just seemed extremely unfair after all that Ezio had gone through to get there, and that ***** couldn't even be bothered to answer a few questions for him.