OK, game endings are always controversial. I think the "reward" when you finished Duke Nukem 3D was the best I've ever seen, errr, heard
But I have to say I was a wee bit unimpressed with SE4's. "This game has ended. Thank you for playing Space Empires IV".
Then again, I must admit that's better than "This game has ended. Got your butt kicked again, didn't you, you whiny little beotch?"