It's vulnerable to vote splitting if people get picky and don't express enough preferences, leading to their vote exhausting.
It's vulnerable to vote splitting if people get picky and don't express enough preferences, leading to their vote exhausting.
Its also vulnerable to small manipulations ("Hylland Free Riding") if voters are able to identify that their preferred candidate will be easily elected, and focus their top preferences on more marginal candidates so other peoples' votes are made to do the work of electing that preferred candidate.
i.e. you can take away the power of other voters' lower preferences, where you agree with their top preferences but disagree on lower preferences. Bit too obscure for practical advice in an election like this though.