Approval voting is easy to explain and does not have theoretical problems of instant runoff voting. In approval voting, voters answer YES/NO for all candidates. Candidates with most YES win.
Approval voting suffers from most of the same problems as plurality voting - a candidate can still be elected despite not being approved or preferred by a majority.
https://www.youtube.com/watch?v=JtKAScORevQ
>a candidate can still be elected despite not being approved or preferred by a majority.
Only if there are no candidates preferred by a majority, in which case no voting system can produce a result people are happy with. The only way a ranked system could avoid this is by forcing people to choose between options they hate, and calling that a majority, which doesn't seem much better than letting someone with 30% approval win because it was the most. In fact, there's no reason you couldn't add a majority victory criterion to approval voting.