I liked Nemesis, but it has it's flaws, maybe we could compromise:
Shinzon still could have been a clone or something, but they really did NOT need to create the Remans. The plot would have gotten on just fine without them. The new Preator could have been a known Romulan. Like Tomalak or Sela; not some new character created just for the film.
Not that it would have been a successful film finanically given it's competition, but it would have been more enjoyable overall at least to me.