The trouble with Score is that optimal voter strategy there is to min-max your ratings -- score(max) everyone you'd accept and score(min) everyone else -- which would make it functionally equivalent to Approval if everyone did so; however, since not everyone will, voters who use the full score range are just voluntarily, albeit unwittingly, diluting their ballot power to determine the actual winner vs. voters who use min-max strategy.
E.g., suppose your favorite is a minor-party longshot, and your second choice is a major-party frontrunner; you might naively rate your favorite 5/5 and your second 4/5, but that doesn't much help your favorite actually win since they're a longshot, and it nerfs the... (read more)
The trouble with Score is that optimal voter strategy there is to min-max your ratings -- score(max) everyone you'd accept and score(min) everyone else -- which would make it functionally equivalent to Approval if everyone did so; however, since not everyone will, voters who use the full score range are just voluntarily, albeit unwittingly, diluting their ballot power to determine the actual winner vs. voters who use min-max strategy.
E.g., suppose your favorite is a minor-party longshot, and your second choice is a major-party frontrunner; you might naively rate your favorite 5/5 and your second 4/5, but that doesn't much help your favorite actually win since they're a longshot, and it nerfs the... (read more)