Rating the real endings:
WYLB/STVI tie - STVI would have won, but then "Guess who's coming to dinner..." isn't as funny as I remembered it.
Terra Prime - About as good an ending as Enterprise would have gotten, considering the circumstances.
Nemesis - just dumb in every way possible.
Endgame - haven't actually seen it yet, but I know what happens, and it's bad. Maybe there's some stuff there that could bump it up above NEM though - wouldn't be hard.
And now that I've actually watched it, I will bump "Endgame" above Nemesis. That was actually a good episode, as least as far as VOY goes. It did go downhill after Harry made his speech, and Chuckles/Seven was weird, at best (but at least Beltran decided to act in the last episode), but overall way above VOY's average. I thought the ending was good enough - I don't think I could stomach any actual celebrations from that show, and it worked well enough on its own anyways.