Final Level: Fleet Battle
Why It Sucked: We get that the Helghast are the bad guys, but genocide is pretty much never cool. And then to strongly imply that the target of said accidental genocide—the dude they were actually trying to kill—escapes? Double not cool.
How We Would End It: That final scene was heavy, but it really got to us—it was good. Then Stahl escapes? Really? It's not like there's going to be a Killzone 4. Oh, please say there won't be a Killzone 4!