It highlights the main reason I'm against it - the spoiler effect, whereby under FPTP people cannot vote for the party they want to because it will mean a worse party will get in. So even if the Awesome party came into existence, who were clearly better than (say) Labour in every way, the majority wouldn't risk voting for them, because it would split the anti-Conservative vote, and let them win.
Original post on Dreamwidth - there are
