You must be joking? Almost no one ever votes their true preference in first-past-the-post. People usually vote for the lesser evil of the top two candidates, because any other strategy (like voting for who you'd actually like to win the election) just wastes your vote.

In any case, check out eg https://en.m.wikipedia.org/wiki/Approval_voting for other people's thoughts on the system. There's much more online about all aspects and pros and cons that we don't need to rehash.