Maemo and several other sane countries have been using STV or "run-off voting" for some time because it is by far superior to one-vote, especially for multi-position elections. There are tons of pages on why that's the case, google it.

One-vote is by far the simplest to comprehend, but is not at all the most effective. Run-off or STV is not all that much harder to comprehend. To calculate, maybe, but not to comprehend.

This is coming from someone who lives in a country where we still use one-vote for 99% of our elections... Trust me, it sucks, and you don't want it here. It strips 3rd parties from the ability to complete, and leaves everyone unhappy.