(following may contain Spoilers)
Personally, I think a good plot for Infamous 2 would be you playing as The Beast mentioned in the 1st game, and you can prove the prophecies true and be all evil and what not, or Screw the Destiny You have Fire and try and do good, though either way your hunted down by Cole, who can either be evil and try to secure his position as the strongest superhuman, or if he's good and your good, he'll be a Templar-esque figure, trying to kill you because he assumes you'll become what Kessler told him you would.
And you'd get to play with Fire instead of Lightning, and anyone who says that wouldn't be fun is lying.
Personally, I think a good plot for Infamous 2 would be you playing as The Beast mentioned in the 1st game, and you can prove the prophecies true and be all evil and what not, or Screw the Destiny You have Fire and try and do good, though either way your hunted down by Cole, who can either be evil and try to secure his position as the strongest superhuman, or if he's good and your good, he'll be a Templar-esque figure, trying to kill you because he assumes you'll become what Kessler told him you would.
And you'd get to play with Fire instead of Lightning, and anyone who says that wouldn't be fun is lying.