Approval voting
Opponents argue that voters still have some of the problems of plurality voting, which is that they do not know if they will need to compromise their vote or not(tactical voting). Giving approval to a compromise candidate could result in that compromise candidate winning, when their favorite would have won had they not given approval to the compromise candidate. It is possible for 51% of voters (a majority) to view a candidate as their first choice but for that candidate to lose to a compromise candidate because many of those voters approved the compromise candidate as well. Not knowing whether or not to compromise is a problem with all voting systems when at least three strong candidates run.